diff --git a/du4/program.c b/du4/program.c
index 70a1e3d..0bceb04 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -41,11 +41,15 @@ int count=0;
 int eof;
 for(;eof!=EOF;count++){
     eof=0;
+    int k=0;
     str=(char*)malloc(100);
     int ind=0;
     for(int i=0;eof!='\n';i++){
         eof=getchar();
         if(eof==EOF) break;
+        if(!isdigit(eof) && eof!='.' && eof!=' '){
+            k++;
+        }
         if(eof!=' '){
             str[ind]=eof;
             ind++;
@@ -53,6 +57,11 @@ for(;eof!=EOF;count++){
     }
 	if(eof==EOF) break;
     sscanf(str,"%lF%c%lF=%lF ",&a,&ac,&b,&c);
+    free(str);
+    if(k>3){
+        result[count]=3;
+        continue;
+    }
     switch(ac){
         case '+':
             add(a,b,c,ac,result,count);
@@ -67,9 +76,8 @@ for(;eof!=EOF;count++){
             divi(a,b,c,ac,result,count);
             break;
         default:
-            result[count]=3;
+        result[count]=3;
     }
-    free(str);
 }
     count--;
     for(int j=0;j<count;j++){