programming-examples/python/_Basics/Input an integer (n) and computes the value of n+nn+nnn.py

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)