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int digitDegree(int n) {
    int i = 0; 
    while (n >= 10) {
        n = sumdig(n);
        i++;
    }
    return i;
}
int sumdig(int n) {
    int r = 0; 
    while (n != 0) {
        r += n % 10;
        n /= 10;
    }
    return r;
}