import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  }
} Main public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  } main {
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  } Scanner s = new Scanner(System.in); s new Scanner(System.in) int a = s.nextInt(); a s.nextInt() s.nextInt s int b = s.nextInt(); b s.nextInt() s.nextInt s int c = s.nextInt(); c s.nextInt() s.nextInt s int sum = 0; sum 0 int ok = 0; ok 0 for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    } int i = 0; int i = 0; i 0 i < 1000 i 1000 i++ i++ i {
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    } {
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    } sum = a + sum sum a + sum a sum if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      } sum < (double)c+0.5 sum (double)c+0.5 (double)c 0.5 {
        ok = ok + b;
      } ok = ok + b ok ok + b ok b if(sum > (double)c+0.5){
        break;
      } sum > (double)c+0.5 sum (double)c+0.5 (double)c 0.5 {
        break;
      } break; System.out.println(ok) System.out.println System.out System System.out ok String[] args args public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  }
} public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  }
} Main
import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    int sum = 0;
    int ok = 0;
    for(int i = 0; i < 1000; i++){
      sum = a + sum;
      if(sum < (double)c+0.5){
        ok = ok + b;
      }else if(sum > (double)c+0.5){
        break;
      }
    }
    System.out.println(ok);
  }
}
