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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int M;
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cin >> M;
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int max = INT32_MIN, min = INT32_MAX;
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for (int i = 0; i < M; ++i) {
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int c;
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cin >> c;
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if (c > max)max = c;
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if (c < min)min = c;
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}
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cout << max - min << endl;
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return 0;
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}
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