111

#include <iostream>
using namespace std;
int main() {
int a, i, j  = 0, x;
cin >> a;
i = 7;
for(int c = 0; c <= 30; ++c) {
    x = ((a & i) >> c);
    if (x == 7) {
        j++;
    }
    i <<= 1;


}
cout << j;
}