#include <stdio.h>
int main () {
    int a=0,b=11,c=0,d=0,e=0;
    printf("Enter num:\n");
    scanf("%d",&a);
    while(b>=10){
        c=a/100;
        d=a/10%10;
        e=a%10;
        b=c+d+e;
        a=b;
    }
    printf("Sum of numbers is %d",&a);
	return 0;
}