#include<bits/stdc++.h> 
using namespace std; 
int jx(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<<jx(a)+jx(b)+jx(c)+jx(d)+jx(e)<<endl;
}