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#include<iostream>
using namespace std;

int money,cost,mum,death;
int flag=0;
int main ()
{
    for(int i=1;i<=12;i++)
    {
        money+=300;  
        cin>>cost;    
        money-=cost;     
           if(money<0)     
           {     
              flag=1;      
              death=i;    
              break;            
           }
        mum+=money/100;     
        money%=100;                 
    }    
    if(flag==0)      
    {
        money+=mum*120;    
        cout<<money;
    }            
    else
    {
        cout<<-death;
    }    
    return 0;
}