#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair <ll, ll> pii; #define fi first #define se second #define pb push_back const int MOD = 1e9 + 7; const int MAX = 2e5 + 5; const int dx[4] = {0, 0, 1, -1}; const int dy[4] = {1, -1, 0, 0}; #define int ll signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); int h, w; cin >> h >> w; int a[h + 5], b[w + 5]; for(int i = 1 ; i <= h ; i++)cin >> a[i]; for(int i = 1 ; i <= w ; i++)cin >> b[i]; map <int, int> mp; for(int i = 1 ; i <= h ; i++){ for(int j = i + 1 ; j <= h ; j++){ mp[a[j] - a[i]]++; } } ll ans = 0; for(int i = 1 ; i <= w ; i++){ for(int j = i + 1 ; j <= w ; j++){ ans += mp[b[j] - b[i]]; } } cout << ans << endl; return 0; }