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