#define Z(C,D,P)for(R=l=0,h=N-1;l<h;l<h&&(C))for(;l<h&&v[l]+v[h]P 0;D);l=!printf("%d ",R);
c(int*a,int*b){return*a-*b;}v['abc'],N,R,l;main(h){for(N--;~scanf("%d",&v[N++]););qsort(v,--N,4,c);Z(R++|l++|h--,h--,>=)Z(R++|l++|h--,l++,<=)Z(v[l++]+v[h]||R++|h--,h--,>)}