#include <iostream>
 
    using namespace std;
 
    int main() {
        long long A, B, C, D;
        cin >> A >> B >> C >> D; // Read the four numbers
 
        // Extract the last two digits of each number
        int a_last = A % 100;
        int b_last = B % 100;
        int c_last = C % 100;
        int d_last = D % 100;
 
        // Calculate the product of the last two digits
        int product_last_two = (a_last * b_last) % 100;
        product_last_two = (product_last_two * c_last) % 100;
        product_last_two = (product_last_two * d_last) % 100;
 
        // Print the result
        cout << product_last_two << endl;
 
        return 0;
    }

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