Unique PIN Codes

#include <iostream>
using namespace std;
int main()
{
    int a;
    int b;
    int c;

    cin >> a >> b >> c;

    for (int num1 = 2; num1 <= a; num1+=2) {
        for (int num2 = 1; num2 <= b; num2++) {
            for (int num3 = 2; num3 <= c; num3+=2) {
                if (num2 == 2 || num2 == 3 || num2 == 5 || num2 == 7) {
                    cout << num1 << " " << num2 << " " << num3 << endl;
                }
            }
        }
    }

    return 0;
}