L, R, M = map(int, input().split())
a = [1]
b = [1]
for i in range(1, M+1):
    a.append(a[-1]*i%M)
    b.append(b[-1]*a[-1]%M)
ans = 0
for i in range(L, min(R, M)+1):
    ans += b[i]
    ans %= M
print(ans)