Uri 2767

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pb push_back
#define p_b pop_back
#define si stack<int>
#define sll stack<ll>
#define sc stack<char>
#define vi vector<int>
#define vll vector<ll>
#define mii map<int, int>
#define msi map<string, int>
#define mci map<char, int>
#define qc queue<char>
#define qi queue<int>
#define qll queue<ll>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n, m, k;
    while(cin >> n >> m >> k){
        mii m1, m2;
        ld count = 0;
        for(int i = 0; i < n; i++){
            int x;
            cin >> x;
            m1[x%k]++;
        }

        for(int i = 0; i < m; i++){
            int x;
            cin >> x;
            m2[x%k]++;
        }

        count = m1[0]*m2[0];
        for(int i = 1; i < k; i++){
            count += m1[i]*m2[k-i];
        }

        cout << fixed << setprecision(0) << count << "\n";
    }
    return 0;
}