#include <iostream>
using namespace std;
int main() {
int a, b, c , d;
cin >> a >> b >> c >> d;
int primero;
if (a < b && a < c && a < d) {
primero = a;
}
else if (b < c && b < d) {
primero = b;
}
else if (c < d) {
primero = c;
}
else {
primero = d;
}
cout << primero;
return 0;
}
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