#ifdef _MSC_VER # define _CRT_SECURE_NO_WARNINGS # define _USE_MATH_DEFINES # include # define __builtin_popcount __popcnt #endif #include using namespace std; using i32 = int; using i64 = long long int; using f64 = double; using u32 = unsigned int; using u64 = unsigned long long int; using str = string; template using vec = vector; void in() { } template void in(T &&x, TS &&...xs) { cin >> x; in(move(xs)...); } template void out(T &&x) { cout << x << "\n"; } template void out(T &&x, TS &&...xs) { cout << x << " "; out(move(xs)...); } #define indef(t, ...) t __VA_ARGS__; in(__VA_ARGS__) #define get(t) []{ t x; cin >> x; return x; }() #define times(n, i) for (i32 i = 0; i < (n); ++i) #define range(a, b, i) for (i32 i = (a); i < (b); ++i) #define upto(a, b, i) for (i32 i = (a); i <= (b); ++i) #define downto(a, b, i) for (i32 i = (a); i >= (b); --i) #define all(xs) (xs).begin(), (xs).end() #define sortall(xs) sort(all(xs)) #define reverseall(xs) reverse(all(xs)) #define even(x) ((abs(x) & 1) == 0) #define odd(x) ((abs(x) & 1) == 1) #define bit(x, i) (((x) >> i) & 1) #define append emplace_back #define bisect_left lower_bound #define bisect_right upper_bound #define bound(a, x, b) (a <= x && x <= b) const i64 MOD = 1000000007ll; const f64 EPS = 1e-10; f64 b[3]; i64 solve() { in(b[0], b[1], b[2]); f64 r = (b[2]-b[1])/(b[1]-b[0]); f64 d = b[1] - (b[0] * r); return (i64)round(b[2] * r + d); } i32 main() { ios::sync_with_stdio(false); #ifdef _MSC_VER /** ifstream fin("input.txt"); cin.rdbuf(fin.rdbuf()); assert(fin); ofstream fout("output.txt"); cout.rdbuf(fout.rdbuf()); assert(fout); /**/ #endif cout << fixed << setprecision(9); out(solve()); return 0; }