#!/usr/bin/env python3
    from functools import reduce
    from typing import List, Optional
    
    def min_pair(min: Optional[int], val: Optional[int]) -> Optional[int]:
        if min is None or val < min:
            return val
        else
            return min
    
    def min(foo: List[int]) -> Optional[int]:
        return reduce(min_pair, foo)