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

typedef unsigned long ulong;

#define RSIZE (1<<19)
char rbuf[RSIZE+1];

int main(){
	int rlast=0;
	if(read(0,rbuf,RSIZE)<RSIZE){
		rlast=1;
	}
	char*rp=rbuf;
	while(*rp++>=48);
	ulong res=0;
	do{
		if(rlast){
			if(!*rp){
				break;
			}
		}else{
			long d=rbuf+RSIZE-rp;
			if(d<24){
				memcpy(rbuf,rp,d);
				rp=rbuf;
				int nr=read(0,rbuf+d,RSIZE-d);
				if(nr==0){
					break;
				}
				if(d+nr!=RSIZE){
					rbuf[d+nr]=0;
					rlast=1;
				}
			}
		}
		ulong a=0;
		for(int c;c=*rp++-48,c>=0;)a=a*10+c;
		res+=a;
	}while(*rp);
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	ulong _z=res;
	do*--wp=_z%10+48;while(_z/=10);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}