Accept integer N and compute N+NN+NNN¶

Write a python program that accepts an integer N

and computes the value of N + NN + NNN.

Sample value of N:

5

Expected Result:

615

a = int(input("Input an integer : "))

n1 = int( "%s" % a )
n2 = int( "%s%s" % (a, a) )
n3 = int( "%s%s%s" % (a, a, a) )

print(n1 + n2 + n3)