class Main
{
public static void main
(String[] args
) {
java.
util.
Scanner in
= new java.
util.
Scanner(System.
in); int a = in.nextInt(), b = in.nextInt(), n = in.nextInt(), k;
k
= (int)Math.
ceil((double)(n
- b
) / (b
- a
)); System.
out.
println(2 * k
+ 1); }
}
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