diff --git a/du4/program.c b/du4/program.c
index ea71802..e14ab87 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,158 +1,77 @@
-#include <stdio.h>
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-char array[100];
-char array1[100];
-char number1[100];
-char number2[100];
-char answer[100];
-int p=0;
-float zero=0;
-char znak1;
-char znak2;
-float firstN=0;
-float secondN=0;
-float answer1=0;
-float myAnswer=0;
-char c;
-char r;
-char q;
-int count = 0;
-int scan(char* array2){
-char* r = fgets(array1,100,stdin);
-if (r == NULL){
-        return -1;
-}
-        else{
-        return 0;
-        }
-}
+#include<stdio.h>
+#include<math.h>
+struct try
+{
+  double number1;
+  char sign;
+  double number2;
+  double final;
+};
+void ok();
+void zle();
 int main(){
-scan(array1);
-int i=0;
-while(i<100){
-        i=i+1;
-        if(array1[i]!='\n'){
-	        count=count+1;
-	}	
-        if(array1[i]=='\n'){	
-	        if(array1[i+1]=='\n')
-		{ 
-		array1[i]='#';
-		break;
-		}
-	}
-        else
-	{
-	count=count+1;
-	}
+struct try y1[20];
+int idx =0;
+while (5){
+  int r = scanf("%lf", &y1[idx].number1);
+       if (r == -1){
+           break;
+       }
+  scanf(" %c ", &y1[idx].sign);
+  scanf("%lf", &y1[idx].number2);
+  scanf(" = %lf",&y1[idx].final);
+  idx=idx+1;
 }
-i=0;
-int j=0;
-int t=0;
-while(array1[t]!='#'){
-        array[p]=array1[t];
-        if(array1[t]=='='){
-	t=t+1;
-	p=p+1;
-	if(array1[t]==' '){
-		array[p]=array1[t];
-		t=t+1;
-		p=p+1;
-		}
-	while(array1[t]!=' ')
-		{
-		if(array1[t]=='#'){
-                        break;
-                        }
-		        array[p]=array1[t];
-		        t=t+1;
-		        p=p+1;
-		        }
-                while(array[i]!='\0'){
-	                if(array[i]=='+'||array[i]=='-'||array[i]=='/'||array[i]=='*'){
-	                        break;
-	                }
-	                else if(array[i]=='1'||array[i]=='2'||array[i]=='3'||array[i]=='4'||array[i]=='5'||array[i]=='6'||array[i]=='7'||array[i]=='8'||array[i]=='9'||array[i]=='0'||array[i]=='.'){
-	                        number1[j]= array[i];
-	                        i=i+1;
-	                        j=j+1;
-	                }
-	                else if(array[i]==' ' || isalpha(array[i])){i++;}
-	                        else{
-	                        printf("CHYBA\n");
-	                        return 0;
-	                        }
-                        }
-                znak1=array[i];
-                i=i+1;
-                j=0;
-                while(array[i]!='='){
-                        if(array[i]=='1'||array[i]=='2'||array[i]=='3'||array[i]=='4'||array[i]=='5'||array[i]=='6'||array[i]=='7'||array[i]=='8'||array[i]=='9'||array[i]=='0'||array[i]=='.'){
-                                number2[j]=array[i];
-                                j=j+1;
-	                        i=i+1;
-                        }
-	else if(array[i]==' '){
-                i=i+1;
-                }
-        else{
-                i=i+1;
-                p=p+1;
-        }
+int nikita=0;
+while (nikita < idx){
+        idx=idx+1;
+  if(y1[nikita].sign == '+'){
+    if (round((y1[nikita].number1 + y1[nikita].number2)*100)/100 == y1[nikita].final)
+    {
+      ok();
+      break;
+    } else{
+      zle();
+      break;
+    }
+  }
+  if(y1[nikita].sign == '-'){
+    if (round((y1[nikita].number1 - y1[nikita].number2)*100)/100 == y1[nikita].final){
+        ok();
+        break;
+    } else{
+        zle();
+        break;
+    }
+  }
+  if(y1[nikita].sign == '*'){
+    if (round(y1[nikita].number1 * y1[nikita].number2 * 100) / 100 == y1[nikita].final)
+    {
+        ok();
+        break;
+    } else
+    {
+      zle();
+      break;
+    }
+    
+  }
+  if(y1[nikita].sign == '/'){
+    if (round(y1[nikita].number1 / y1[nikita].number2 * 100) / 100 == y1[nikita].final)
+    {
+      ok();
+      break;
+    } else{
+      zle();
+      break;
+        } 
+  }
 }
-        znak2=array[i];
-        i++;
-        j=0;
-        j=0;
-while(array[i]=='1'||array[i]=='2'||array[i]=='3'||array[i]=='4'||array[i]=='5'||array[i]=='6'||array[i]=='7'||array[i]=='8'||array[i]=='9'||array[i]=='0'||array[i]==' '||array[i]=='.'){
-        if(array[i]=='1'||array[i]=='2'||array[i]=='3'||array[i]=='4'||array[i]=='5'||array[i]=='6'||array[i]=='7'||array[i]=='8'||array[i]=='9'||array[i]=='0'||array[i]=='.'){
-        answer[j]=array[i];
-        i=i+1;
-	j=j+1;
-        }
-	else if(array[i]==' '){
-                i=i+1;
-        }else{
-                i=i+1;
-                p=p+1;
-                }
-        }
-        j=0;
-        float firstN = atof(number1);
-        float secondN = atof(number2); 
-        float answer1 = atof(answer);
-        if(znak1=='-'){
-                myAnswer=firstN-secondN;
-        }
-        else if(znak1=='+'){
-                myAnswer=firstN+secondN;
-        }
-        else if(znak1=='/'){
-                myAnswer=firstN/secondN;
-        }
-        else if(znak1=='*'){
-                myAnswer=firstN*secondN;
-        }
-                zero = myAnswer-answer1;
-        if(zero>=-0.00001&&zero<=0.00001){
+  return 0;
+}
+void ok(){
         printf("OK\n");
-        }
-        else{
-                printf("ZLE\n");
-        }
-        i=0;
-        p=-1; 
-        memset(array,0,100);
-        }
-        p=p+1;
-        t=t+1;
-        scanf("\n%c",&q);
-        if(c=='\n'){
-        return 0;
-        }
 }
-        return 0;
+void zle(){
+      printf("ZLE\n");  
 }
\ No newline at end of file