#include <iostream>

int X,Y,N;
double r, rest;

double mocnina(double a,int n)
{
double *temp=new double[20];
double * end(temp + 20);

for (double * pnter(temp);pnter!=end;++pnter)
	*pnter=0;
temp[0]=a;
double * tmp(temp);
for (double * pnter(temp+1);pnter!=end;++pnter,++tmp)
{
	
	*pnter=(*tmp)*(*tmp);
}	

int exp(1024*512);
double res(1);

while(n)
{

//std::cout<<n<<"  "<<res<<"  "<<exp<<"  "<<*tmp<<std::endl;
	if (n >=exp)
	{
		n -= exp;
		res *= *tmp;
	}
	else
	{
		--tmp;
		exp/=2;
	}
}
	
return res;
}

int main() {

/*std::cout << mocnina(2,10);
return 0;*/
	while( true ) {
		scanf( "%d %d %d", &X,&Y,&N);
		std::cin >> r;
		
		if( X == 0 && Y == 0 && N == 0 && r == 0 ) break;
r=1+(r / 12 / 100);
		rest = X;
		double rn;
	
		rn=mocnina(r,N*12);
			
		if( rest*rn-(Y*((rn-1)/(r-1))) > 0 ) {
			printf( "NO\n" );
		}
		else
			printf( "YES\n" );
	}

	return 0;
}