import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
l,r,m = na()
r = min(r, m)
l = min(l, r)
ans = 0

f = [1]
for i in range(m):
    f.append(f[-1]*(i+1)%m)

for i in range(m):
    f[i+1] *= f[i]
    f[i+1] %= m

for x in range(l, r+1):
    ans += f[x]
    ans %= m
print(ans)