Getting Error

I am new to codechef and while reading input() I am getting error and seen
so may sites for solution but error is not solved

ATM(Python) -->
x,y = list(map(float,input().split()))
if x%5==0:
print("%.2f"%(y-x-.50))
else:
print("%.2f"%(y))

Error -->
Traceback (most recent call last):
File “./prog.py”, line 1, in
EOFError: EOF when reading a line

Please help to solve this…