9. Least common multiples

The least common multiple or LCM of two positive integers A and B, which is written LCM(A, B), is the smallest positive integer that is a multiple of both A and B. For example, LCM(30, 42) is 210 because 210 is the smallest positive integer that is a multiple of 30 (210 = 7 × 30) and 42 (210 = 5 × 42).

Write a program that calculates LCMs. Use the program to verify that LCM(1234567000, 7654321000) = 9,449,772,114,007,000.