#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;}

#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);}

#define XMAX 1000000000

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	RD(p);
	RD(q);
	RD(a);
	if(a&&p<=q){
		write(1,"1000000000",10);
		_exit(0);
	}
	if(!a&&p>=q){
		write(1,"0",1);
		_exit(0);
	}
	int z,pi,qi;
	if(p<q){
		z=XMAX-100;
		pi=0;
		qi=0;
	}else{
		z=(a-1)*100/(p-q)-1;
		pi=p*z;
		qi=q*z;
	}
	for(int i=0;i<100;++i){
		pi+=p;
		qi+=q;
		z+=pi/100<qi/100+a;
	}
	char wbuf[16],*wp=wbuf;
	WT(z);
	write(1,wbuf,wp-wbuf);
	_exit(0);
}