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#include <bits/stdc++.h>
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//十年OI一场空，不开long long见祖宗~
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using namespace std;
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typedef long long LL;
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int main() {
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int n;
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cin >> n;
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LL a = 1, b = 1, c = 0;
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for (int i = 3; i <= n; i++) {
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c = a + b;
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a = b;
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b = c;
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}
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cout << c << ".00" << endl;
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return 0;
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}
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