L,R,M=map(int,input().split())
ap=[1]
aap=[1]
for i in range(M): ap.append(ap[-1]*(i+1)%M)
for i in range(M): aap.append(aap[-1]*ap[i+1]%M)
ans=0
for i in range(L,R+1):
  if i>=M: break
  ans+=aap[i]
  ans%=M
print(ans)