x,y=input().split()
y=float(y)
if(x>0andx<=2000)and(y>0andy<=2000)and(float(x)+0.5<=y)and(x%5==0):
y=y-x-0.5
print("%.2f"%y)
else:
print("%.2f"%y)
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ATM problem please tell whats wrong..
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