ДЗ3, №5

#include <iostream>
#include <stdlib.h>
#include <cmath>
using namespace std;
int main() {

    int a, b, c, d, g, i = 0, x1, x2, x3, y1, y2, y3;
    cin >> a;
    c = 0;
    g = 0;
    while(a) {
        b = a % 2;
        a /= 2;
        c = c * 10 + b;
        g++;

    }
    a = 0;
    if(g < 3) {
        cout << 0;
        exit(0);
    }
    for(d = 0; (d + 2) < g; d++) {
    x1 = c / pow(10, d);
    x2 = c / pow(10, d + 1);
    x3 = c / pow(10, d + 2);
    y1 = x1 % 10;
    y2 = x2 % 10;
    y3 = x3 % 10;
    if(y1 == 1 && y2 == 1 && y3 == 1) {
        ++i;
    }
}
cout << i;
}