Today is Friday. What's the day of 1996 in three days? There's another question. What's the day of 1996 in two days? It's urgent
3 mod 7 = 33 ^ 2, mod 7 = 23 ^ 3, mod 7 = - 13 ^ 4, mod 7 = 43 ^ 5, mod 7 = 53 ^ 6, mod 7 = 11996, mod 6 = 43 ^ 1996, mod 7 = 4, so the day after 3 is Friday + 4 = Tuesday, 2 mod 7 = 22 ^ 2, mod 7 = 42 ^ 3, mod 7 = 11996, mod 3 = 12 ^ 1996, mod 7 = 2, after 2