''' Purpose: introduce nested looping.
        for a user-supplied n, loop n times, where on the ith iteration
        the integers from 0 to i are printed out.
'''

import time

# get n
reply = input( 'Enter number: ' )
n = int( reply )

# performed the repeated printing of a number series
for i in range( 0, n ) : # HOW MANY ROWS I WANT
    # print a line of the form 
    #    row i: 0 1 2 ... i
    print( "Row", i)
    for j in range( 0, i + 1 ): # FILLING IN EACH ROW (FOR EACH ROW DO THIS)
        print ( "    j=", j, end=" ")
    print()
    # to do so need to first print the row i: part
    # then on same line print out the values 0 1 2 ... i one after the other

# Nested For Loops:
    # The inner loop must execute for one iteration of the
    # outer loop before it goes to the next outer loop iteration