模拟，按题意模拟即可

#include<iostream>
using namespace std;
int main(){
    int x,res=0,score=0,last=0;
    while(cin>>x&&x){
        if(x==1){
            score=1;
            res+=score;
        }
        else{
            if(last==1)score=2;
            else score=score+2;
            res+=score;
        }
        last=x;
    }
    cout<<res<<endl;
    return 0;
}