   int main(){
       int l1,l2,i,sum=0,w=0;
       float rate,result;
       char zfc_1[600],zfc_2[600];
       scanf("%f",&rate);
       scanf("%s",zfc_1);
       scanf("%s",zfc_2);
       l1=strlen(zfc_1);
       l2=strlen(zfc_2);
       for(i=0;i<l1;i++){
       if((l1!=l2)||(zfc_1[i]!='A'&&zfc_1[i]!='T'&&zfc_1[i]!='G'&&zfc_1[i]!='C')||(zfc_2[i]!='A'&&zfc_2[i]!='T'&&zfc_2[i]!='G'&&zfc_2[i]!='C')){
         printf("error");
         w=1;
         break;
         }
       else{
         if(zfc_1[i]==zfc_2[i]){
           sum++;}
         else{continue;}
         }
       }
       result=1.00*sum/l1;
       if(result>rate){
         printf("yes");}
       else if((result<=rate)&&(w==0))
         printf("no");
       return 0;
       }