View Code of Problem 103

#include<stdio.h>
int main(void)
{
	int a,b,n = 0,i;
	scanf("%d%d",&a,&b);
	for(;a <= b;a++)
	{
		for(i = 2;i*i <= a;i++)
			if(a%i == 0)
				break;
		if((i*i) > a)
			n++;
	}
	printf("%d",n);
}