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#include <bits/stdc++.h>
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using namespace std;
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int min(int a, int b, int c, int d) {
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    return min(min(a, b), min(c, d));
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}
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int main() {
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    int a, b, c, d;
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    cin >> a >> b >> c >> d;
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    cout << min(a, b, c, d);
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    return 0;
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}
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