25 lines
339 B
C++
25 lines
339 B
C++
#include <cmath>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <iomanip>
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#include <iostream>
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using namespace std;
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int dg(int);
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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<<dg(n);
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return 0;
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}
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int dg(int i)
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{
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if (i == 1)
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return 0;
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else if (i == 2)
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return 1;
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else
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return dg(i - 1) + dg(i - 2);
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}
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