Today is Wednesday. What day is it in five hundred days?

Today is Wednesday. What day is it in five hundred days?

The remainder of (a * b) △ C = (the remainder of a / C) * (the remainder of B / C)
5 ^ 100 = 25 ^ 50, divided by 7, the remainder is 4 ^ 50
4 ^ 50 = 16 ^ 25, divided by 7, the remainder is 2 ^ 25
2 ^ 25 = 32 ^ 5, divided by 7, the remainder is 4 ^ 5
4 ^ 5 = 16 * 64, divided by 7, the remainder is 2 * 1 = 2
therefore
5 ^ 100 divided by 7, the remainder is 2
So 5 ^ 100 days after Wednesday is Friday