[easy] If, and.

[woooee]

You want to check the other numbers also

n1=int(input("N1: "))
n2=int(input("N2: "))
n3=int(input("N3: "))
for num in [n1, n2, n2]:
    ## a number will never be greater than itself
    ## so there is no harm in comparing it to itself
    if num >= n1 and num >= n2 and num >= n3:
        print(num)