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- #include <iostream>
- #include <vector>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- vector< vector<int> > c(3, vector<int> (2, 0));
- for(int i=0;i<n;i++){
- int a;
- cin>>a;
- c[a%3][(int)(a%5==0)]++;
- }
- int ans=(c[0][1]*c[0][1]-1)/2;
- ans+=c[0][1]*c[0][0];
- ans+=c[1][1]*c[2][0];
- ans+=c[2][1]*c[1][0];
- ans+=c[1][1]*c[2][1];
- cout<<ans;
- }
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