C language: the sorting problem of circle number reporting

problem ：
from n A circle of individuals , Sequence number . Count from the first person （ from 1 To 3 Number off ）, Usually arrive 3 Of the people out of the circle , Ask the last one who left the original number .
Code

#include <stdio.h>
int main()
{
    
	int num[50],n,*p,j,loop,i,m,k;
	printf(" Please enter the number of people in this circle ：");
	scanf("%d",&n);
	p = num;
	for(j = 0 ; j < n ; j++){
    
		*(p+j) = j+1;
	}
	i = 0;
	m = 0;
	k = 0;
	while(m<n-1){
    
		if(*(p+i)!=0){
    
			k++; 
		}
		if(k==3){
    
			k = 0;
			*(p+i)=0;
			m++;
		}
		i++;
		if(i==n){
    
			i = 0;
		}
	}
	printf(" Now the rest are ：");
	for(loop=0;loop<n;loop++){
    
		if(num[loop]!=0){
    
			printf("%2d Number \n",num[loop]);
		}
	}
	return 0;
}