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- #include <bits/stdc++.h>
- using namespace std;
- int main(){
- int n,m,k,ai,ho[100001],mu[100001];
- while(cin>>n>>m>>k){
- memset(mu,0,sizeof mu);
- for(int i = 0; i < n; i++){
- cin>>ho[i];
- }
- for(int i = 0; i < m; i++){
- cin>>ai;
- mu[ai%k]++;
- }
- int ans = 0;
- for(int i = 0; i < n; i++){
- ans+=mu[(k-(ho[i]%k))%k];
- }
- cout<<ans<<endl;
- }
- return 0;
- }
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