/* Sum up primes. */

#include <stdio.h>

int
main()
{
    int	i, n, limit, sum = 0;

    printf("Enter limit: ");
    scanf("%d", &limit);

    for (n = 2; n <= limit; ++n) {

	/* Test if 'n' is prime. */
	for (i = 2; i < n; ++i) {
	    if (n % i == 0) break;
	}
	if (i == n) sum += n;

    }

    printf("Sum of primes <= %d is %d\n",
	   limit, sum);
    return 0;
}