#include <iostream>
using namespace std;
int main()
{
	int i,ys,bg=0,cq,dq=0;
	for(i=1;i<=12;i++)
	{
		cin>>ys;
		dq=dq+300;
		if(dq-ys>=100)
		{
			cq=((dq-ys)/100)*100;
			dq=dq-cq;
		 }
		else if(dq<ys)
		{
			cout<<"-"<<i;
			return 0;
		}
	}
		
		
	
		
		cout<<dq+dq*0.2;
		return 0;

}