3033 计算打车费用

#include<bits/stdc++.h>
#define f(i,s,e) for(int i = s; i <= e; i++)
#define ll long long
using namespace std;
const int N = 1e3+10,inf = 0x3f3f3f3f;

int main()
{
    int n;
    cin >> n;
    if(n <= 2) cout << 6;
    else cout << 6 + (n - 2) * 2; //超出2公里部分 
    return 0;
}