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OI-codes/problem/P5743/P5743.cpp
2020-09-23 19:24:13 +08:00

18 lines
226 B
C++

// R38781374
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, sum;
sum = 1;
cin >> n;
for (int i = n-1; i > 0; i--) {
sum++;
sum *= 2;
}
cout << sum;
return 0;
}