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| #include<iostream>
using namespace std;
int main(){
int m;
cin>>m;
int ls[110];
for(int i = 1;i<=m;i++){
cin>>ls[i];
}
int cnt = 0;
int b = 0;
for(int i = 1;i<=m;i++){
for(int j = 1;j<m;j++){
for(int k = j+1;k<=m;k++){
if (ls[j] + ls[k] == ls[i] && ls[i] != ls[j] && ls[i] != ls[k]){
cnt++;
b = 1;
break;
}
}
if(b == 1){
b = 0;
break;
}
}
}
cout<<cnt<<endl;
return 0;
}
|