#include<bits/stdc++.h> using namespace std; int main(){ int h,jj=0,mm=0; for(int i=1;i<=12;i++){ cin>>h; jj+=300; if(jj<h){ cout<<-i; return 0; } jj-=h; mm+=jj/100; jj=jj%100; } cout<<mm*100+jj; return 0; }