#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
using lll=__int128_t;

// 頼んだ！128bit!!
std::ostream &operator<<(std::ostream &dest, __int128_t value) {
  std::ostream::sentry s(dest);
  if (s) {
    __uint128_t tmp = value < 0 ? -value : value;
    char buffer[128];
    char *d = std::end(buffer);
    do {
      --d;
      *d = "0123456789"[tmp % 10];
      tmp /= 10;
    } while (tmp != 0);
    if (value < 0) {
      --d;
      *d = '-';
    }
    int len = std::end(buffer) - d;
    if (dest.rdbuf()->sputn(d, len) != len) {
      dest.setstate(std::ios_base::badbit);
    }
  }
  return dest;
}

namespace Lib{
  lll extGCD(lll a, lll b, lll &x, lll &y){
    if(b==0){
      x=1,y=0;
      return a;
    }
    lll d=extGCD(b,a%b,y,x);
    y=y-a/b*x;
    return d;
  }
}

pair<lll,lll> crt(vector<ll> m,vector<ll> r){
  assert(m.size()==r.size());
  int n=m.size();
  ll ret_m=1,ret_r=0;
  for(int i=0;i<n;i++){
    __int128_t x=0,y=0,d=Lib::extGCD(ret_m,m[i],x,y);
    if(ret_r%d!=r[i]%d){
      return make_pair(-1ll,-1ll);
    }
    lll ret_m2=lcm(ret_m,m[i]);
    lll ret_r2=ret_r+x*(((r[i]-ret_r)/d*ret_m)%ret_m2)%ret_m2;
    // cout<<"x "<<x<<" ret_r2 "<<ret_r2<<" ret_m "<<ret_m<<" ret_m2 "<<ret_m2<<" d "<<d;
    ret_m=ret_m2;
    ret_r=(ret_r2%ret_m+ret_m)%ret_m;
    // cout<<" ret_r "<<ret_r<<'\n';
  }
  return make_pair(ret_r,ret_m);
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  vector M(3,0ll),R(3,0ll);
  for(int i=0;i<3;i++)cin>>R[i]>>M[i];
  auto [ans,mod]=crt(M,R);
  if(ans==0)ans+=mod;
  cout<<ans<<'\n';
  for(int i=0;i<3;i++){
    // cout<<(ans%M[i]==R[i])<<'\n';
  }
}