#include<bits/stdc++.h>
using namespace std;
int wangziang(int a)
{
if(a==0)
{
	return 1;
}
else
{
	return a*jx(a-1);	
}
}int main(){
int a,b,c,d,e;
cin>>a>>b>>c>>d>>e;
cout<<wangziang(a)+wangziang(b)+wangziang(c)+wangziang(d)+wangziang(e)<<endl;}