p37e3

#include <iostream>
#include <cmath>
using namespace std;

bool prime (int n)
{
	double a = sqrt((double)n);
	if (n==1) return true;

	for (int i=2; i < floor(a)+1; i++)
			if (n%i==0) return false;

	return true;
}

int main (void)
{
	int a,b;
	cout << "Enter a & b" << endl;
	cin >> a >> b;

	int k=0;
	for (int i=a; i<=b; i++)
		if (prime(i)==false)
			k+=i;
	cout << "Result = " << k << endl;
}