diff --git a/du4/program.c b/du4/program.c
index 1cf4302..c12b6dc 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,100 +1,128 @@
 #include <stdio.h>
-#include<string.h>
-#include<math.h>
-#include<stdlib.h>
-char* compactString(char *src,int leng) {
-    char *new_str = (char*)calloc(leng+1,sizeof(char));
-    int k=0;
-    for(int i=0;i<leng;i++){
-        if(src[i]!=' '){
-            new_str[k] = src[i];
-            k++;
-        }
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <math.h>
+
+struct res{
+    double na,nb,result;
+    char sign;
+}list [10];
+
+int fill(double*,double*,char *,double *);
+double count(const double*,const double *,char);
+int aget(double *);
+int sget(char *);
+int efinde(void);
+char checkend(void);
+
+int main(){
+    int cond;
+    char fcond=1;
+    int i;
+    for(i=0;fcond!=EOF;i++){
+        fcond=checkend();
+        if(fcond==EOF)
+           break;
+        
+        cond=aget(&list[i].na);
+        if(cond<0){
+            printf("CHYBA\n");
+            return 0;}
+        cond=sget(&list[i].sign);
+        if(cond<0){
+            printf("CHYBA\n");
+            return 0;}
+        cond=aget(&list[i].nb);
+        if(cond<0){
+            printf("CHYBA\n");
+            return 0;}
+        cond=efinde();
+        if(cond<0){
+            printf("CHYBA\n");
+            return 0;}
+        cond=aget(&list[i].result);
+        if(cond<0){
+            printf("CHYBA\n");
+            return 0;}
+        /*if((fcond=checkend())!='\n'){
+            printf("1CHYBA %d\n",(int)fcond);
+            return 0;}*/
+        if(fcond==-1)
+            break;
+        //printf("%lf %c %lf = %lf\n",list[i].na,list[i].sign,list[i].nb,list[i].result);
     }
-    return new_str;
-}
-
-
-
-double operation(double first,double second,char c){
-    double x =0;
-    if(c=='*'){
-         x=first*second;
-        return x;
-    }
-    else if(c =='-'){
-         x=first-second;
-        return x;
-    }
-    else if(c=='/'){
-         x=first/second;
-        return x;
-    }
-    x= first+second;
-    return x;
-}
-
-
-double round_to(double value, double eps)
-{
-
-  return floor(value/eps + 0.5) * eps;
-}
-
-double compare_percent(double a, double b, double eps)
-{
-  double diff = round_to( (a - b) * 2 / (a + b), eps);
-  return diff < 0 ? -1 : diff > 0 ? +1 : 0;
-}
-
-int check(char *str){
-    int flag=0;
-    char symb[5]="*-+/=";
-    for(int i =0;i<strlen(str);i++){
-        for(int k =0;k<5;k++){
-            for(int j =0;j<5;j++){
-                if(str[i]==symb[j]&&str[i+1]==symb[k]){
-                    return 0;
-                }
-            }
-        }
-        if(str[i]=='='){
-            flag=1;
-        }
-        if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z')||str[i]==','){
+    for(int x=0;x<i;x++){
+        double fin=count(&list[x].na,&list[x].nb,list[x].sign);
+        //printf("%lf %lf\n",fin,list[x].result);
+        if((long)(fin*1000000)!=(long)(list[x].result)*1000000){
+            printf("ZLE\n");
             return 0;
         }
     }
-    return flag==1?1:0;
-}
-
-
-int main()
-{
-    char str[100][100];
-  	for(int i =0;fgets(str[i],100,stdin);i++){
-  	    if(str[i][0]=='\n'){
-  	        break;
-  	    }
-    	char *new_str = compactString(str[i],strlen(str[i]));
-    	double first =-5,second =-5,res=-5;
-    	char c='E';
-    	sscanf(new_str,"%lf%c%lf%*[=]%lf",&first,&c,&second,&res);
-    
-    
-    	if(c!=43&&c!=42&&c!=45&&c!=47||check(new_str)==0){
-    	    printf("CHYBA\n");
-          	continue;
-    	}
-    	double my_res = operation(first,second,c);
-    	if(compare_percent(res,my_res,0.01)==0){
-    	    printf("OK\n");
-    	}
-    	else{
-    	    printf("ZLE\n");
-   	    }
+    printf("OK\n");
     
 }
+char checkend(void){
+    char c;
+    int count=1;
+    c=getchar();
+    while((c=getchar())){
+        ++count;
+        if(c==EOF || c=='\n'){
+            fseek(stdin,-count,SEEK_CUR);
+            return c;
+        }
+        else if(!isspace(c)){
+            fseek(stdin,-count,SEEK_CUR);
+            return c;
+        }
+    }
+    return -2;
+}
+double count(const double*na,const double *nb,char sign){
+    
+    if(sign=='+')
+        return *na+*nb+0.00000000001;
+    else if(sign=='-')
+        return *na-*nb;
+    else if(sign=='*')
+        return *na*(*nb);
+    else if(sign=='/')
+        return *na/(*nb);
+    
+    return -1;
+}
 
-    return 0;
+int aget(double *na){
+    char a[30];
+    char c;
+    char *p;
+    p=a;
+    while(isspace(c=getchar()));
+    if(isdigit(c)){
+        *(p++)=c;
+        while(isdigit(c=getchar())|| c=='.') *(p++)=c;
+        *p='\0';
+        *na=atof(a);
+    }else
+        return -1;
+    fseek(stdin,-1,SEEK_CUR);
+    return 1;
+}
+int sget(char *sign){
+    char c;
+    while(isspace(c=getchar()));
+    if(c=='+' || c=='-' || c=='/' || c=='*')
+       *sign=c;
+    else
+        return -1;
+    return 1;
+}
+int efinde(void){
+    char c;
+    while(isspace(c=getchar()));
+    if(c!='=')
+        return -1;
+    return 1;
 }
\ No newline at end of file