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#include <bits/stdc++.h>

using namespace std;

int n, k, v[1000005], ans;

int main(){
    ifstream fin("3secv.in");
    ofstream fout("3secv.out");
    
    fin>>n>>k;
    for(int i=1; i<=n; i++){
        fin>>v[i];
        v[i]+=v[i-1];
        for(int j=0; j<i; j++){
            if((v[i]-v[j])%3==k){
                ans++;
            }
        }
    }
    fout<<ans;
    
    return 0;
}
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