h, w, m = map(int, input().split())
mod = 998244353

if h + w > m + 1:
    exit(print(0))

def fact(a, b):
    ret = 1
    for i in range(a, b+1):
        ret *= i
        ret %= mod
    return ret

print(fact(m-h-w+2, m)*pow(fact(1, h+w-1), -1, mod)*fact(w, h+w-2)*pow(fact(1, h-1), -1, mod)*pow(m, h*w-(h+w-1), mod)%mod)