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

// 快速幂
int qmi(int a, int b) {
    int res = 1;
    while (b) {
        cout << "b = " << (b & 1) << ", a = " << a << endl;
        if (b & 1) res = res * a;
        b >>= 1;
        a = a * a;
    }
    return res;
}
signed main() {
    cout << qmi(2, 10) << endl;
}