#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; }