L,R,M = map(int,input().split())
if L>=M:
    ans = 0
else:
    A = list(range(M))
    A[0] = 1
    for i in range(2,M):
        A[i] = (A[i-1]*i)%M
    ans = 1
    for i in range(2,L+1):
        ans = (ans*A[i])%M
    B = [1]*(M-L)
    for i in range(1,M-L):
        B[i] = (B[i-1]*A[L+i])%M
    cnt = 0
    for i in range(min(M-1,R)-L+1):
        cnt = (cnt+B[i])%M
    ans = (ans*cnt)%M
print(ans)