#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    int N, M; 
    ll K; char op;
    cin >> N >> M >> K >> op;

    vector<ll> A(N), B(M);
    rep(i, 0, M) cin >> B[i];
    rep(i, 0, N) cin >> A[i];

    ll sumB = 0LL;
    rep(i, 0, M){
        sumB += (B[i] % K);
        sumB %= K; 
    }

    ll ans = 0LL;
    rep(i, 0, N){
        if(op == '+'){
            ans += (((A[i] % K) * M) % K + sumB) % K;
            ans %= K; 
        }else{
            ans += ((A[i] % K) * sumB) % K;
            ans %= K;
        }
    }
    cout << ans << endl;
    
    return 0;
}