#include <stdio.h>
int main()
{
int x,y,s;
scanf("%d %d",&x,&y);
s=5000-100*0.5*(100-x+y);
printf("%d",s);
return 0;
}
#include <stdio.h>
int main()
{
int x,y,s;
scanf("%d %d",&x,&y);
s=5000-100*0.5*(100-x+y);
printf("%d",s);
return 0;
}