#include <iostream>

using std::cout;
using std::cin;
using std::endl;

template <typename T>
T multiply(T a, T b) {
	return a*b;
}

template <typename U>
U subtract(U a, U b) {
	return a-b;
}

int main(void) {
	cout<<multiply(4,5)<<endl;
	cout<<multiply(subtract(5,3),subtract(3,5))<<endl;
	return 0;
}