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26 lines
373 B
C++
26 lines
373 B
C++
#include <algorithm>
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#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include <cstdio>
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#include <stack>
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#include <ctime>
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#include <cmath>
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#include <queue>
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typedef long long l;
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typedef double d;
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typedef char c;
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using namespace std;
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int wjh(int a){
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if(a<=2){
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return 1;
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}
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return wjh(a-1)+wjh(a-2);
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}
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int main(){
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int a;
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cin >>a;
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cout <<wjh(a)*2;
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return 0;
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}
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