#include <stdio.h>

int isPrime(int n);

int main() {
    int n, limit, sum = 0;
    printf("Enter limit: ");
    scanf("%d", &limit);
    for (n = 2; n <= limit; ++n) {
	if (isPrime(n)) {
	    sum += n;
	}
    }
    printf("Sum of primes <= %d is %d\n",
	   limit, sum);
    return 0;
}