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21 lines
337 B
C++
21 lines
337 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int n, a[55];
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long long ans = 1;
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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sort(a + 1, a + n + 1);
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for (int i = 1; i <= n; i++) {
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ans *= a[i] - i + 1;
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ans %= 1000000007;
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}
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cout << ans << endl;
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return 0;
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}
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