#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b, c, d;
	cin >> a >> b >> c >> d;
	if ((a < b) & (a < c) & (a < d)) cout << a;
	else if ((b < a) & (b < c) & (b < d)) cout << b;
	else if ((c < a) & (c < b) & (c < d)) cout << c;
	else cout << d;
	return 0;
}