You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
#include <bits/stdc++.h>
|
|
|
|
using namespace std;
|
|
const int N = 30;
|
|
int a[N] = {2};
|
|
|
|
int main() {
|
|
int n;
|
|
cin >> n;
|
|
for (int i = 1; i <= n; i++) a[i] = a[i - 1] + pow(2, i - 1);
|
|
printf("%d", a[n]);
|
|
return 0;
|
|
} |
