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#include <iostream>
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using namespace std;
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long long A[10000];
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long long f(long long n) {
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if (A[n] != 0)
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return A[n];
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if (n < 2) return n;
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else {
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return A[n];
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}
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}
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int main()
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{
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int n;
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cin >> n;
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cout << f(n);
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return 0;
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}
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