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#include <iostream>

#define MAXN 10000

using namespace std;

int dp[MAXN],M;

int get_max(int k){

if(k<=0){

return 0;

}

if(dp[k]!=-1)return dp[k];

dp[k] = max(get_max(k-1)+1, get_max(k-3)*2);

return dp[k];

}

void work(){

memset(dp,-1,sizeof(dp));

cout<<get_max(M)<<endl;;

}

int main(){

cin>>M;

work();

return 0;

}