#include <stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    unsigned long long sum = 0;
    unsigned long long term = 1;
    for (int i = 0; i <= n; i++) {
        sum += term;
        term <<= 1;  
    }
    printf("%llu\n", sum);
    return 0;
}