#include <stdio.h>

unsigned int sods ( unsigned int n )
{
    unsigned s = 0, d;

    while (n) {
        d = n % 10;
        s += d * d;
        n /= 10;
    }
    return s;
}

int ishappy ( unsigned int n )
{
    printf("\n    %u\n", n);
    while (1) {
        if (n == 1) return 1;
        if (n == 4) return 0;
        n = sods(n);
        printf(" -> %u\n", n);
    }
}

int main ( )
{
    unsigned int n;

    printf("n = "); scanf("%u", &n);
    if (ishappy(n))
        printf("\n%u is happy\n", n);
    else
        printf("\n%u is unhappy\n", n);
    return 0;
}