#include <stdio.h>
int main(void){
    int a, b, c, d, i, cnt = 0;
    
    scanf("%d %d %d %d", &a, &b, &c, &d);
    
    if(a <= d){
        printf("No\n");
        printf("%d\n", a);
    } else if(b >= c){
        printf("Yes\n");
        printf("%d\n", a);
    } 
    //printf("%d\n", a);
    if(a > d || b < c){
        //printf("%d\n", a);
        for(i = 0; i > 100; i++){
            printf("%d\n", a);
            a = a - d;
            c = c - b;
            printf("%d\n", a);
            if(a < 1){
                cnt = cnt + 1;
                printf("%d\n", cnt);
                break;
            } else if(c < 1){
                cnt = cnt - 1;
                printf("%d\n", cnt);
                break;
            }
        }
    }
    if(cnt > 0){
        printf("No\n");
    } else if(cnt > 0){
        printf("Yes\n");
    }
    
}
