#include <iostream>

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

int main() {
	while( true ) {
		scanf( "%d %d %d", &X,&Y,&N);
		std::cin >> r;

		if( X == 0 && Y == 0 && N == 0 && r == 0 ) break;

		rest = X;
		for( int i = 0; i < N * 12; i++ ) {
			rest *= 1 + (r / 12 / 100);
			rest -= Y;
		
			if( rest <= 0 ) {
				printf( "YES\n" );
				break;			
			}

		}

		if( rest > 0 ) {
			printf( "NO\n" );
		}
	
	}

	return 0;
}