#!/usr/bin/env python3
import sys

if len(sys.argv) < 3:
    print("ERROR:missing_args:usage: metrics-completion-rate.py <total> <done>")
    sys.exit(2)

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

if total == 0:
    print("OK:rate:0.0")
else:
    print(f"OK:rate:{done / total:.4f}")