#include <bits/stdc++.h>
using namespace std;
int main() {
int arr[]= {0, -1, 2, -3, 1};
int n=sizeof(arr)/sizeof(arr[0]);
int x=-2;
bool flag=false;
for(int i=0;i<n;i++){
for(int j=i+1;j<n;j++){
if(i==j)
continue;
else if(arr[i]+arr[j]==x){
cout<<"yes";
flag=true;
break;
}
}
}
if(flag==false)
cout<<"no";
return 0;
}
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