#include<bits/stdc++.h>
using namespace std;
#define ToMaT for(int i=2;i<=10001;++i) 
#define turtle for(int i=1;i<=10001;++i) 
int main(){
    int a[10001],b[10001],c[10001],d[10001];
    a[1]=1;
	ToMaT{
		a[i]=i;
	}
	b[1]=1;
	ToMaT{
		b[i]=b[i-1]+a[i-1];
	}
	c[1]=1;
	ToMaT{
		c[i]=c[i-1]+b[i-1];
	}
	d[1]=1;
	ToMaT{
		d[i]=d[i-1]+c[i-1];
	}
    int n;
    while(cin>>n){
    	cout<<d[n]<<endl;
	}
    return 0;	
}