#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;
}
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