This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld double
const int INF = 1e18;
const int mod = 1e9 + 7;
const int sz = 3e5 + 5;
const int usz = 1e6 + 5;
signed main()
{
ios_base::sync_with_stdio(0);cin.tie(0);
int n;
cin >> n;
if(n == 1)
{
cout << 1 << endl;
return 0;
}
int cur = 1;
for(int i = 1;i <= n - 1;i++)
{
cur *= 2;
cur %= mod;
}
cout << (cur + 1) % mod << endl;
}
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