#include<stdio.h> int main() { int a,b; scanf("%d %d",&a,&b); if(a+b>=0){ if(a+b<=3) printf("YES"); if(a+b>=4) printf("NO"); } else printf("negative"); return 0; }

#include <stdio.h>
int main()
{
    int a,b;
    scanf("%d%d%d",&a,&b);
    if(0<=a+b&&a+b<=3)printf("YES");
    else if(a+b>=4)printf("NO");
    else printf("negative");
    return 0;
}//

#include<stdio.h>
int main()
{int a,b;
scanf("%d %d",&a,&b);
if(0<=a+b&&a+b<=3)
{printf("YES");}
else if(a+b>=4)
{printf("NO");}
else
printf("negative");
return 0;
}

#include <stdio.h> int main() { int a,b;

scanf("%d %d",&a, &b);

if(0 <= a+b && a+b <= 3){
printf("YES");
}
else
if(a + b >= 4){
printf("NO");
	

}
else{printf("negative");}

return 0;

}

#include<stdio.h> int main() { int a,b; scanf("%d %d",&a,&b); if(0<=a+b&&a+b<=3) { printf("YES"); } else if(a+b>=4) printf("NO"); else printf("negative"); } return 0;

#include<stdio.h> int main() { int a,b; scanf("%d %d",&a,&b); if(0<=a+b&&a+b<=3) { printf("YES"); } else if(a+b>=4) printf("NO"); else printf("negative"); }