can someone explain how to fix this error in python program? thank you

line 13: m = int(sys.argv[1])

index error: list index out of range.

10 import stdio import sys 12 13 m = int(sys.argv[1]) d = int(sys.argv[3]) y = int(sys.argv[4]) 16 18 yo = y - (14 - m) / 12 x0 = y + y / 4 - y0 / 100 + y 7 400 m = m + 12 * ((14 - m) 7 12) - 2 D = (d + XO + 31 * m0 / 12) % 7 stdio.writeln(int(D))