View Code of Problem 27

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