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