"""

"""

import sys
from sys import stdin

L,R,M = map(int,stdin.readline().split())

fac = [1]

for i in range(M+10):
    fac.append(fac[-1] * (i+1) % M)

for i in range(len(fac)-1):
    fac[i+1] *= fac[i]
    fac[i+1] %= M

for i in range(len(fac)-1):
    fac[i+1] += fac[i]
    fac[i+1] %= M

if L >= M:
    print (0)
else:
    R = min(R , M)

    ans = fac[R] - fac[L-1]

    print (ans % M)