Submission #1260562

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Source Code Expand

#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int f(long long n)
{
    int ans = 0;
    while(n > 2){
        n = (n - 1) / 2;
        ++ ans;
    }
    return ans;
}

int main()
{
    int x;
    cin >> x;

    long long left = 1;
    long long right = LLONG_MAX / 2;
    while(left < right){
        long long mid = (left + right + 1) / 2;
        if(f(mid) > x)
            right = mid - 1;
        else
            left = mid;
    }
    cout << left << endl;

    return 0;
}

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