#include <iostream>
using namespace std;
int main()
{
int num, sum = 0;
cout << "Enter a number: ";
cin >> num;
for (int i = 2; i <= num; i++)
{
int count = 0;
for (int j = 1; j <= i; j++)
{
if (i % j == 0)
count++;
}
if (count == 2)
sum += i;
}
cout << "The sum of all prime numbers between 1 and " << num << " is " << sum << endl;
return 0;
}