import java.util.*;
class Main {
public static void main
(String[] args
) { Scanner sc
= new Scanner
(System.
in); int A = sc.nextInt();
int B = sc.nextInt();
int V = sc.nextInt();
if (A == V) {
} else if (V - A <= A) {
} else
System.
out.
println((V
- A
) / (A
- B
) + 1);
}
}
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