#include <stdio.h>
int main ( )
{
	int c,x=0,z=0,i,y=0,h[12];
	for(i=0;i<12;i++)
	{
		scanf("%d",&h[i]);
	}
		for(i=0;i<12;i++)
	{
		x+=300;
		if(x+300<h[i])
		{
			printf("-%d\n",i+1);
			return 0;
		}
		c=(x-h[i])/100;
		x=x-c*100-h[i];
		z+=c;
		y++;

	}
	if(y==12)
		printf("%d\n",x+z*120);
	return 0;
}