#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
long long A, B, C, D;
cin >> A >> B >> C >> D;
long long ans=((A%100)*(B%100)*(C%100)*(D%100));
ans%=100;
if(ans<=9){
cout << "0"<<(ans);
}
else{
cout << ans;
}
return 0;
}
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