#!/usr/bin/env python3
import sys

if len(sys.argv) < 3:
    print("ERROR:missing_args:usage: metrics-collision-rate.py <collisions> <sites>")
    sys.exit(2)

try:
    collisions = int(sys.argv[1])
    sites = int(sys.argv[2])
except ValueError:
    print("ERROR:invalid_args:collisions and sites must be integers")
    sys.exit(2)

print(f"OK:rate:{collisions / max(sites, 1):.4f}")