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