#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    ll a[3];
    rep(i,3)cin >> a[i];

    ll ans = ((a[1]-a[2])*a[2]+(a[0]-a[1])*a[1]-(a[1]-a[2])*a[0])/(a[0]-a[1]);

    cout << ans << endl;
    return 0;
}