//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize(3)
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC target("sse3","sse2","sse")
//#pragma GCC target("avx","sse4","sse4.1","sse4.2","ssse3")
//#pragma GCC target("f16c")
//#pragma GCC optimize("inline","fast-math","unroll-loops","no-stack-protector")
//#pragma GCC diagnostic error "-fwhole-program"
//#pragma GCC diagnostic error "-fcse-skip-blocks"
//#pragma GCC diagnostic error "-funsafe-loop-optimizations"
//#pragma GCC diagnostic error "-std=c++14"
#include "bits/stdc++.h"
//#include "ext/pb_ds/tree_policy.hpp"
//#include "ext/pb_ds/assoc_container.hpp"
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fr(x) freopen(x,"r",stdin)
#define fw(x) freopen(x,"w",stdout)
#define iout(x) printf("%d\n",x)
#define lout(x) printf("%lld\n",x)
#define REP(x,l,u) for(ll x = l;x<u;x++)
#define RREP(x,l,u) for(ll x = l;x>=u;x--)
#define complete_unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define mst(x,a) memset(x,a,sizeof(x))
#define all(a) begin(a),end(a)
#define PII pair<int,int>
#define PLL pair<ll,ll>
#define MP make_pair
#define lowbit(x) ((x)&(-(x)))
#define lson (ind<<1)
#define rson (ind<<1|1)
#define se second
#define fi first
#define sz(x) ((int)x.size())
#define EX0 exit(0);

typedef  long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
using namespace std;
typedef vector<ll> VLL;
typedef vector<int> VI;
const int block_size = 320;
typedef complex<ll> point;
const ll mod = 1e9+7;
const ll inf = 1e9+7;
const ld eps = 1e-9;
const db PI = atan(1)*4;
template<typename T>
inline int sign(const T&a) {if(a<0)return -1;if(a>0)return 1;return 0;}
string to_string(string s) {return '"' + s + '"';}string to_string(const char* s) {return to_string((string) s);}string to_string(bool b) {return (b ? "true" : "false");}template <typename A, typename B>string to_string(pair<A, B> p) {return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";}template <typename A>string to_string(A v) {bool first = true;string res = "{";for (const auto &x : v) {if (!first) {res += ", ";}first = false;res += to_string(x);}res += "}";return res;}void debug_out() { cerr << endl; }template <typename Head, typename... Tail>void debug_out(Head H, Tail... T) {cerr << " " << to_string(H);debug_out(T...);}

#ifndef ONLINE_JUDGE
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define dbg(...) {}
#endif

template<typename T,typename S>inline bool upmin(T&a,const S&b){return a>b?a=b,1:0;}
template<typename T,typename S>inline bool upmax(T&a,const S&b){return a<b?a=b,1:0;}

template<typename T> inline void in(T &x) {x = 0;T f = 1;char ch = getchar();while (!isdigit(ch)) {if (ch == '-') f = -1;ch = getchar();}while (isdigit(ch))  {x = x * 10 + ch - '0';ch = getchar();}x *= f;}
ll twop(int x) {return 1LL<<x;}
template<typename T>T MOD(T a, T m){a %= m;if (a < 0)a += m;return a;}
template<typename T>T inverse(T a, T m){a = MOD(a, m);if (a <= 1)return a;return MOD((1 - inverse(m, a) * m) / a, m);}template<typename A,typename B > inline void in(A&x,B&y) {in(x);in(y);}
template<typename A,typename B,typename C>inline void in(A&x,B&y,C&z) {in(x);in(y);in(z);}
template<typename A,typename B,typename C,typename D> inline void in(A&x,B&y,C&z,D&d) {in(x);in(y);in(z);in(d);}
template <typename T>T sqr(T x){return x*x;}
ll gcd(ll a,ll b){return b==0?a:gcd(b,a%b);}



namespace SOLVE {
    ll d[1000100];
    void main(){
        ll k;
        in(k);
        mst(d,0x3f);
        priority_queue<PLL,vector<PLL>,greater<PLL>>pq;
        pq.push(MP(1,1));
        while (sz(pq)) {
            auto f = pq.top();pq.pop();
            if(f.fi<d[f.se]){
                d[f.se] = f.fi;
                pq.push(MP(f.fi+1,(f.se+1)%k));
                pq.push(MP(f.fi,(f.se*10)%k));
            }
        }
        cout<<d[0]<<endl;
        
        
        
        
        
        
        
        
        
        
        
        
        
        
    }
}


signed main() {
#ifndef ONLINE_JUDGE
#endif
    
    
    
    
    
    int t = 1;
//    in(t);
    while(t--){
        SOLVE::main();

    }
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    return 0;
}


Measured memory_bytes: 10228