import sys
input = sys.stdin.readline

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

if(l >= m):
	print(0)
	exit(0)
if(r >= m):
	r = m - 1

a, b = 1, 1
p = 0
s = 0
for i in range(1, r + 1):
	a *= i;  a %= m
	b *= a;  b %= m
	s += b;  s %= m
	if(i == l - 1):
		p = s

ans = s - p
print(ans)