#include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cctype> #include<vector> #include<cmath> using namespace std; int main(void){ int n; long long arr[35]; arr[0]=0; arr[1]=2; arr[2]=5; for(int i=3;i<35;i++){ arr[i]=arr[i-1]*3-1; } while(cin>>n){ cout<<arr[n]<<endl; } } |
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