#include <iostream>
 #include <iomanip>
 #include <cmath>

 using namespace std;
void Rofyda_Elghadban(){
  #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  #endif
}

int main()
 {   Rofyda_Elghadban();
 long long a,b,c,d;
 cin>>a>>b>>c>>d;
 cout<<(a*b*c*d)%100;
  return 0;
 }