#include<bits/stdc++.h>
using namespace std;

int  NumberOf21(int n) {
	int count = 0;
	int k = 1;
	while (n != 0) {
		count++;
		n = (n - 1) & n;
	}
	return count;
}


int main() {
	cout<<NumberOf21(1365765670)<<endl;
	return 0;
}