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# cython: language_level=3
import lcmath
def nCr(n, r):
"""Return the number of ways to choose r elements of a set of n."""
return lcmath.exp(
lcmath.lfactorial(n) -
lcmath.lfactorial(r) -
lcmath.lfactorial(n-r)
)
if __name__ == "__main__":
import sys
if len(sys.argv) != 3:
sys.stderr.write("USAGE: %s n r\nPrints n-choose-r.\n" % sys.argv[0])
sys.exit(2)
n, r = map(float, sys.argv[1:])
print(nCr(n, r))