# age = int(input("ENTER YOUR AGE : "))

# if(age>=18):

# print("yes")

# else:

# print("no")

#================================================================z5

num1 = int(input("Enter the first number : "))

num2 = int(input("Enter the second number : "))

num3 = int(input("Enter the third number : "))

num4 = int(input("Enter the fourth number : "))

if num1>num2 and num1>num3 and num1>num4 :

print("greatest number is : ",num1)

elif num2>num1 and num2>num3 and num2>num4 :

print("greatest number is : ",num2)

elif num3>num1 and num3>num2 and num3>num4 :

print("greatest number is : ",num3)

else :

print("greatest number is : ",num4)

#=========================================================================