Answer 1

What are inputs you are giving?
EOF error occurs here when you don't provide input..
Run code by inputs for sample :
50
1
It works..

edit : may you trying like this:

num=4

while True:
a=input()
num*=int(a)
print(num)
if num>50:
break

print("over")

input: ex:
2
2
2
2