#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int c;while(c=*rp++-48,c>=0)v=v*10+c;}

char wbuf[32];
#define WT(v) *--wp=32;while(*--wp=v%10+48,v/=10);

#define N 100000

int abuf[N*2+1];
#define a (abuf+N)

main(){
	char*rp=mmap(0l,1600l<<10,1,2,0,0ll);
	while(*rp++!=10);
	do{
		int neg=0;
		if(*rp=='-'){
			++rp;
			neg=1;
		}
		RD(x);
		if(neg) x=-x;
		++a[x];
	}while(*rp);

	char*wp=wbuf+sizeof wbuf;

	int mz=a[0]>>1;
	int wz=0,wy=0;
	int dz=0,dy=0;
	int a0=a[-N];
	int a1=a[N];
	for(int i=N;i;){
		mz+=a0<a1?a0:a1;
		wy+=a1;
		dy+=a0;
		--i;
		a0=a[-i];
		a1=a[i];
		{
			int t=a0<wy?a0:wy;
			wz+=t;
			wy-=t;
		}
		{
			int t=a1<dy?a1:dy;
			dz+=t;
			dy-=t;
		}
	}
	WT(mz);
	wz+=wy>>1;
	WT(wz);
	dz+=dy>>1;
	WT(dz);
	write(1,wp,wbuf+(sizeof wbuf)-wp);
	_exit(0);
}