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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 n, i;
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double f[50];
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f[0] = 0;
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f[1] = 1;
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f[2] = 1;
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cin >> n;
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for (i = 3; i <= n; i++)
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f[i] = f[i - 1] + f[i - 2];
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printf("%0.2lf", f[n]);
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return 0;
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}
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