class Solution {
public int solution(int[] number) {
int answer = 0;
int n = number.length;
for(int i = 0; i < n; i++) {
for(int j = i + 1; j < n; j++) {
for(int k = j + 1; k < n; k++) {
if(number[i] + number[j] + number[k] == 0)
answer++;
}
}
}
return answer;
}
}