import sys
input = sys.stdin.readline

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

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

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