import sys
input = sys.stdin.readline

l, r, m = map(int, input().split())

a, b = 1, 1
for i in range(1, l + 1):
	a *= i;  a %= m
	b *= a;  b %= m
ans = 0
for i in range(l, r + 1):
	a *= i;  a %= m
	b *= a;  b %= m
	ans += b;  ans %= m
print(ans)