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#include <bits/stdc++.h>

#define int long long

#define dl long double

#define ff first

#define ss second

#define pb push_back

#define forn(i,n) for(int i=0;i<(int)n;i++)

#define fastio ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

#define MAXN 1000100

#define inf 1000000000

using namespace std;

typedef pair<int,int> pii;

const int MOD = 1e9+7;

int dp[MAXN];

int pot[10];

int solve(int x){

if(dp[x]!=-1)return dp[x];

if(x==0)return 0;

int res=inf;

vector<int> v;

int X = x;

while(X>0){

int y = X%10;

v.pb(y);

X=X/10;

}

for(int i=0;i<(int)v.size();i++){

int y = v[i];

if(y==0)continue;

res = min(res,1+solve(x-y));

}

return dp[x]=res;

}

int32_t main(){

fastio;

int a;

cin>>a;

memset(dp,-1,sizeof(dp));

pot[0]=1;

for(int i=1;i<10;i++)pot[i]=10*pot[i-1];

cout<<solve(a)<<endl;

}