inline T read(){ T sum = 0, fl = 1; char ch = getchar(); for (; !isdigit(ch); ch = getchar()) if (ch == '-') fl = -1; for (; isdigit(ch); ch = getchar()) sum = sum * 10 + ch - '0'; return sum * fl; }
template <typename T>
inlinevoidwrite(T x){ if (x < 0) { putchar('-'), write<T>(-x); return; } static T sta[35]; int top = 0; do { sta[top++] = x % 10, x /= 10; } while (x); while (top) putchar(sta[--top] + 48); }
intmain(){ a = read<int>(), b = read<int>(), c = read<int>(); write<int>(3 * max({a, b, c}) - (a + b + c)); return0; }