#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int reverse(int n) {
    int r = 0;
    while (n > 0) {
        r = r * 10 + (n % 10);
        n /= 10;
    }
    return r;
}

int main() {
    int a;
    int r;
    int sum;
    int rSum;
    int count = 0;
    scanf("%d", &a);

    while(1) {
        count++;
        r = reverse(a);
        sum = a+r;
        rSum = reverse(sum);
        if(sum == rSum) break;
        else a = sum;
    }

    printf("%d", count);
    
    return 0;
}