l,r,M=map(int,input().split())
l=min(l,M-1)
r=min(r,M-1)
fa=[1]
for i in range(1,M+1):
  fa+=[fa[-1]*i%M]
a=0
s=1
for i in range(l):
  s*=fa[i]
  s%=M
for i in range(l,r+1):
  s*=fa[i]
  s%=M
  a+=s
  a%=M
print(a)