#include <iostream>
using namespace std;

int main() {
    int num;
    cin >> num;
    int cnt = 0;
    int maxC = 0;
    while (num != 0) {
        if (num % 2 == 1) {
            cnt++;
        } else {
            cnt = 0;
        }
        num = num / 2;
        maxC = max(maxC, cnt);
    }
    cout << maxC << endl;
}

转化为2进制时顺便计数