#!/usr/bin/env python3;
# Begin Main
a = 3

a += 1
print("a += 1: " + str(a))
a -= 1
print("a -= 1: " + str(a))

a += 2
print("a += 2 : " + str(a))
a *= 3
print("a *= 3 : " + str(a))
a -= 4
print("a -= 4 : " + str(a))
a /= 5
print("a /= 5 : " + str(a))