import sys
input = sys.stdin.readline

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

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