#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[1<<20];
#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define WT(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

static inline max0(int x){
	return x>=0?x:0;
}

#define INF 0x70000000

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	char*wp=wbuf;
	while(*rp++>=48);
	do{
		RD(a);
		RD(b);
		RD(c);
		int x,y,z;
		if(a>c){int t=a;a=c;c=t;}
		a-=x=a==c;
		y=b>2?max0(c-(b-1))+max0(a-(b-2)):INF;
		z=a>1?max0(b-(a-1)):INF;
		x+=y<z?y:z;
		if(!a|x>=INF){
			*wp++=45;
			*wp++=49;
		}else{
			WT(x);
		}
		*wp++=10;
	}while(*rp);
	write(1,wbuf,wp-wbuf);
	_exit(0);
}