def f(l,r,m):
	r1=1
	r2=1
	ans=0
	if(m<=l):return 0
	
	for i in range(1,l):
		r1=(r1*i)%m
		r2=(r2*r1)%m
		
	for i in range(l,min(m+1,r+1)):
		r1=(r1*i)%m
		r2=(r2*r1)%m
		ans=(ans+r2)%m
	return ans

l,r,m=map(int,input().split())
print(f(l,r,m))