algorithmStudy/13301.cpp at master · judy5050/algorithmStudy · GitHub

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//
//  13301.cpp
//  algorithm_study
//
//  Created by 박효정 on 2021/02/06.
//

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;
long long dp[82];
int main(){


    cin.tie(0);
    cout.tie(0);

    int num=0;
    cin>>num;

    dp[1]=1;
    dp[2]=1;

    for(int i=3;i<=num+1;i++){
        dp[i]=dp[i-1]+dp[i-2];
    }


    long long result=dp[num]*2+dp[num+1]*2;

    cout<<result<<"\n";


    return 0;
}