#include <iostream>
#include <math.h>
#include <vector>

using namespace std ;

int main () {
    int n = 4040;
    vector<int> a(4040, 0);
    a[0] = 0;
    a[1] = 1;
    for (int i = 1; i < 2020; i++){
        a[i * 2] = a[i];
        a[i * 2 + 1] = a[2  * i] + 1;
    }
    // for(auto i: a) cout << i << " ";
    int counter = 0;
    for (auto i: a)
        if (i == 7) counter++;
    cout << counter;
}