#define _CRT_SECURE_NO_WARNINGS
//#define _USE_MATH_DEFINES
#include<stdio.h>
//#include<stdlib.h>
//#include<math.h>
//#include<string.h>
//#include<time.h>
//#define pi acos(-1.0)
#define P(type,x) fprintf(stdout,"%"#type"\n",x)
#define S(type,x) fscanf(stdin,"%"#type,&x)
int main() {
	int a, b;
	while (fscanf(stdin, "%d%d", &a, &b), a, b)
		if (a*b % 2) puts("yes");
		else puts("no");
	return 0;
}