View Code of Problem 27

#include <stdio.h>
#include <math.h>
int sheep(int i){
	int j,k;
	k= sqrt(i);
	for(j=2; j<=k; j++)
	{
		if(i%j==0)
			return 0;
	}
	return i;
}

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