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#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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const int N = 110;
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LL a[N];
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int main() {
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int n;
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scanf("%d", &n);
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a[1] = a[2] = 1;
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for (int i = 3; i <= n; i++) a[i] = a[i - 1] + a[i - 2];
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printf("%lld.00", a[n]);
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return 0;
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} |
