l,r,m = map(int,input().split())
if l > m:
    print(0)
    exit()

r = min(r,m)

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