View Code of Problem 27

#include <stdio.h>
#include <stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>
long int sushu(int a, int b)
{
	long int sum=0;
	int flag;
	for (int i = a + 1; i < b; i++)
	{
		if (i == 1)
			continue;
		flag = 0;
		for (int j = 2; j<= sqrt(i); j++)
		{
			
			if (i%j == 0)
			{
				flag = 1;
				break;
			}
		}
		if (flag == 0)
		{
			sum += i;
			
		}
	}
	return sum;
}
int main()
{
	int a, b;
	long int sum;
	while (scanf("%d%d", &a,&b) != EOF)
	{
		sum = sushu(a, b);
		printf("%ld\n", sum);
	}

	return 0;
}