#include <bits/stdc++.h>
using namespace std;
template <typename T>
inline bool chkmin(T &x, T y) {
  return x > y ? x = y, 1 : 0;
}
template <typename T>
inline bool chkmax(T &x, T y) {
  return x < y ? x = y, 1 : 0;
}
template <typename T>
inline void read(T &x) {
  char ch = getchar();
  int f = 1;
  x = 0;
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0', ch = getchar();
  x *= f;
}
template <typename T, typename... Args>
inline void read(T &x, Args &...args) {
  read(x), read(args...);
}
int a, b;
long long calc(long long x, long long y) {
  if (!y) return -x;
  return calc(y, x % y) + x / y * y * 2;
}
int main() {
  read(a, b);
  printf("%lld\n", a + calc(max(b, a - b), min(b, a - b)));
  return 0;
}
