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#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e6 + 10;//<2F>ⵥ<EFBFBD><E2B5A5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int a[N];//ÿ<><C3BF><EFBFBD>ⵥ<EFBFBD><E2B5A5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int main() {
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int n;
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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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sort(a + 1, a + 1 + n);
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int h = 1;//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><F3A3ACB4>Ƚϵ<C8BD><CFB5>ⵥ<EFBFBD><E2B5A5>
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for (int i = 1;;) { //ö<><C3B6>ÿһ<C3BF>죬<EFBFBD><ECA3AC><EFBFBD><EFBFBD>breakֹͣ
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if (a[h] >= i) //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߵ<EFBFBD>һ<EFBFBD><D2BB>
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i++;
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if (++h > n) {
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cout << i - 1 << endl;
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break;
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}
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}
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return 0;
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}
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