#include <iostream>
 
using namespace std;
 
int main() {
    long long a , b ,c ,d;
    cin >> a >> b >> c >> d;
 
    //calc product
    long long product = a * b * c * d;
 
    //get the last two digits
    int lastTwoDigits = product % 100;
 
    //print result
    cout << lastTwoDigits << endl;
 
    return 0;
 
}
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