View Code of Problem 103

#include<stdio.h>
#include<math.h>
int sushu(int a){
	for(int i=2;i<=sqrt(a);i++){
		if(a%i==0)
		return 0;
	}
	return 1;
} 

int main(){
	  int a,b;
	  while(scanf("%d %d",&a,&b)!=EOF){
	  int sum=0;
	  for(int i=a;i<=b;i++){
	  	if(sushu(i)==1) 
	  	sum++;
	  } 
	  printf("%d\n",sum);
	  }
}