#include <iostream>
int main(int argc, char *argv[])
{
int n;
std::cout << "Enter n.." << std::endl;
std::cin >> n;
std::cout << ((n % 10) * (n / 10 % 10) * (n / 100 % 10) * (n / 1000 % 10)) << std::endl;
return 0;
}
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