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

using namespace std ;

int main () {
    int n = 2019;
    int a[n];
    a[0] = 0;
    a[1] = 1;
    for (int i = 2; i < n; i += 2){
        a[i] = a [i / 2];
        a[i + 1]= a[i / 2] + 1;
    }
    int counter = 0;
    for(auto i: a)
        if (i == 7) counter++;
    cout << counter;
}