this is the answer

this is the answer

#include<bits/stdc++.h>
using namespace std;
int main(){
    long long x,sum=0;
    cin>>x;
    for(int i=1;i<x+1;i++){
        long long sum1=1;
        for(int j=1;j<i+1;j++){
            sum1*=j;
        }
        sum+=sum1;
    }
    cout<<sum;
    return 0;
}

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