浙大PAT甲级-1008

小学生算术题

#include <iostream>

using namespace std;

int main()
{
    int n, i, time=0;
    int a=0, b;
    cin>>n;
    i=n;
    while(i--){
        cin>>b;
        if(b>a){
            time+=(b-a)*6;
        }else if(b<a){
            time+=(a-b)*4;
        }
        a=b;
    }
    time+=n*5;
    cout<<time<<endl;
    return 0;
}