#include<stdio.h>

enum DAY
{
	MON=1,TUE,WED,THU,FPI,SAT,SUN,
};

int main()
{
	enum DAY day;
	int n,m=0,i;
	scanf("%d%d",&day,&n);
	for(i=day;i<=n;i++)
	{
		if(day!=SAT||day!=SUN)
		m+=250;
		else continue;
	}
	printf("%d",m);
	return 0;
}