蟠桃记

复制代码

#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    long long n;
    while (cin >> n){
        if (n == 0){
            //cout << 1 << endl;
            continue;
        }
        int ans = 1;
        for (int i = n - 1; i >= 1; i--){
            ans = (ans + 1) * 2;
        }
        cout << ans << endl;
    }

    //system("pause");
    return 0;
}