#include<stdio.h>
#include<math.h>
main(){
    int A,B,C;
    scanf("%d%d%d",&A,&B,&C);
    int x = ceil(A/(double)B);
    int y = ceil(A/(double)C);
    if(x >= (double)(y*3.0/2.0)){
        printf("YES\n");
    }else{
        printf("NO\n");
    }

}