无脑

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
string multiplyByTwo(const string &num) {
    string result;
    int carry = 0;
    for (char c : num) {
        int digit = c - '0';
        int product = digit * 2 + carry;
        result.push_back((product % 10) + '0');
        carry = product / 10;
    }
    if (carry > 0) {
        result.push_back(carry + '0');
    }
    return result;
}
string subtractOne(const string &num) {
    string result = num;
    int i = 0;
    while (i < result.size() && result[i] == '0') {
        result[i] = '9';
        i++;
    }
    if (i < result.size()) {
        result[i] -= 1;
    }while (result.size() > 1 && result.back() == '0') {
        result.pop_back();
    }
    return result;
}

int main() {
    int n;
    cin>>n;
    string power = "1"; 
    for (int i = 0; i < n; ++i) {
        power = multiplyByTwo(power);
    }
    string result = subtractOne(power);
    reverse(result.begin(), result.end());
    cout << result << endl;

    return 0;
}