/*Example -1

Input number: 0 
Binary value: 00000000
Output: Yes, all bits are unset 
Example -2

Input number: 50 
Binary value: 00110011
Output: No, all bits are not unset*/ 

#include <stdio.h>

int isallbitUNset();

int main(){
    unsigned int n;
    
    scanf("%d",&n);
    
    if (isallbitUNset(n)){
        printf("all bits are unset");
    }
    else{
        printf("all bits are not unset");
    }
}

int isallbitUNset(unsigned int no){
    int loop, count=0;
    
    
    for(loop=7;loop>=0;loop--){
        
        //check, if there is any SET/HIGH bit
        if(no & (1<<loop)){
            count=1;
            break;
        }
    }
    if(count==0)
        return 1;//true
    else 
        return 0;//false
}