#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    long long a,b,c;
    cin >> a >> b >> c;
    cout << b + (c-a)*(c-b)/(b-a) << endl;
    return 0;
}