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#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define maxn 1000005
ll a[maxn];
int main(){
 
    ll ans=0;
    ll n,m;
    cin>>n>>m;
    ll i,j;
    for(i=0;i<n;i++) cin>>a[i];
    sort(a,a+n);
    for(i=0;i<n-1;i++){
        ll pivot = m-a[i];
        if(pivot<=0) continue;
        ll pt = upper_bound(a+i+1,a+n,pivot) - a;
        ans = ans + max((pt-i-1),0LL);
    }
    cout<<ans;
    return 0;
}# your code goes here

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "./prog.py", line 2
    using namespace std;
                  ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 2
    using namespace std;
                  ^
SyntaxError: invalid syntax

Standard output is empty