import subprocess
import sys
from pathlib import Path

cases = [{'input': '7 4\n1 2\n1 3\n1 4\n3 5\n3 6\n4 7\n', 'output': '7'}, {'input': '4 1\n1 2\n1 3\n2 4\n', 'output': '2'}, {'input': '8 5\n7 5\n1 7\n6 1\n3 7\n8 3\n2 1\n4 5\n', 'output': '9'}, {'input': '2 1\n1 2\n', 'output': '1'}, {'input': '20 7\n9 7\n3 7\n15 9\n1 3\n11 9\n18 7\n17 18\n20 1\n4 11\n2 11\n12 18\n8 18\n13 2\n19 2\n10 9\n6 13\n5 8\n14 1\n16 13\n', 'output': '38'}, {'input': '3 2\n1 2\n1 3\n', 'output': '2'}, {'input': '3 1\n1 2\n2 3\n', 'output': '2'}]
solution = Path(__file__).with_name("solution.py")
for index, case in enumerate(cases):
    proc = subprocess.run(
        [sys.executable, str(solution)],
        input=case["input"],
        text=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        timeout=10,
    )
    if proc.returncode != 0:
        raise AssertionError(f"case {index} exited {proc.returncode}: {proc.stderr}")
    got = proc.stdout.strip()
    expected = case["output"].strip()
    if got.split() != expected.split():
        raise AssertionError(
            f"case {index} output mismatch\nexpected={expected!r}\ngot={got!r}\nstderr={proc.stderr}"
        )
print('deepcoder_primeintellect_io')