#include <stdio.h>
int main(void){
    long int N = 0;
    scanf("%ld", &N);
    long int P = N + 1;
    int a = 0;
    while(a == 0){
        if(P%10 == 0){
            P = P / 10;
        }
        else if(P == 1){
            printf("Yes\n");
            a = 1;
        }
        else{
            printf("No\n");
            a = 1;
        }
    }

    return 0;
}