#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int inf_int=2e9;
ll inf_ll=2e18;
typedef pair<int,int> pii;
#define pb push_back
const double pi=3.1415926535898;
#define dout if(debug) cout
#define fi first
#define se second
#define sp setprecision
#define debug 0
#define up asdasd
#define down asdasdasd
void solve()
{
     long double a,b,n;
     cin >> a >> b >> n;
     long double best=inf_int;
     int ans=0;
     for(int i=1;i<=n;i++)
     {
         long double x=1.0*i*a/b;
         long double up=ceil(x);
         long double down=floor(x);
     //    cout << i <<" "<<x<<" "<<up<<" "<<down<<endl;
         long double dif1=abs(up/i-a/b);
         long double dif2=abs(down/i-a/b);
         if(dif1<best )
         {
             if(dif1==dif2 && up!=down)
             {
                 ans+=2;
             }
             else
             {
                 ans++;
             }
         }
         else if(dif2<best)
         {
             ans++;
         }
       // cout << ans<<endl;
         best=min(best,dif1,dif2);
       //  cout << best<<endl;

     }
     cout << ans;


}

#define FILE "approximate"
int main()
{

     //   freopen("input.txt","r",stdin);
      //  freopen("output.txt","w",stdout);

 //  freopen(FILE".in","r",stdin);
  // freopen(FILE".out","w",stdout);
       if(!debug)
       {
           ios_base::sync_with_stdio(0);
            cin.tie(0);
            cout.tie(0);
       }

        int t=1;
        while(t--)
            solve();
        return 0;
}