#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define int long long

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int a, b, c;
	cin >> a >> b >> c;
	
	double r = (double)(b - c) / (a - b);
	double d = b - r*a;

	double ans = r * c + d;
	if (ans >= 0) ans += 0.5;
	else ans -= 0.5;
	cout << (int)ans << endl;


    return 0;
}