Submission

Score: 100

User: tull

Problemset: Sigma Croissant

Language: cpp

Time: 0.003 second

Submitted On: 2026-04-26 00:08:02

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(A) A.begin(),A.end()
const int N=1e3+10;
signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    int fact[30];
    fact[0]=1;
    fact[1]=1;
    int sum=1;
    int n;
    cin>>n;
    for(int i=2;i<=n;++i){
        fact[i]=fact[i-1]*i;
        sum+=fact[i];
    }
    cout<<sum;
}