def most_frequent_value(d: dict) -> tuple:
    frequency = {}
    for value in d.values():
        if value in frequency:
            frequency[value] += 1
        else:
            frequency[value] = 1
    max_value = None
    max_count = 0
    for value, count in frequency.items():
        if count > max_count:
            max_count = count
            max_value = value
    return(max_value, max_count)

if __name__ == "__main__":
    print(most_frequent_value({"a": 1, "b": 2, "c": 1, "d": 3}))