#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;
 long long num1,num2;
 int digits;
 num1==4;digits;
 num2==1;digits;
 cin>>a>>b>>c>>d;;
 if(a*b*c*d==num1){
 cout<<(a%100*b%100*c%100*d%100)%100<<"\n";
 }else if(a*b*c*d==num2){
     cout<<num2<<"\n";
 }
  return 0;
 }