#include <stdio.h>
#include <stdlib.h>


int main()
{
   int save=0,temp,hold=0,flag=0,g;
   for(int i=0;i<12;i++){
       scanf("%d",&temp);
       save+=100*((hold-temp+300)/100);
       hold=(hold-temp+300)%100;
       if(hold<0){
           g=i+1;
           flag=1;
       }
   }
   if(flag==0)printf("%d",save/5+save);
   else printf("-%d",g);
   return 0;
}