def main():
    A, B, C, D = map(int, input().split())

    max_by_glue = float('inf') if A == 0 else C // A
    max_by_borax = float('inf') if B == 0 else D // B

    result = min(max_by_glue, max_by_borax)
    print(result)

if __name__ == "__main__":
    main()