#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

long long gcd(long long a, long long b){
    return b?gcd(b, a%b):a;
}

vector<long long> exgcd(long long a, long long b){
    if(b==0) return vector<long long>{1, 0, a};
    auto res = exgcd(b, a%b);
    return vector<long long>{res[1], res[0]-a/b*res[1], res[2]};
}

pair<long long, long long> crt(
    long long a0, long long m0, long long a1, long long m1){
    long long g = gcd(m0, m1);

    if(a0%g != a1%g)return make_pair(-1, -1);

    if(g > 1){
        m0 /= g;
        m1 /= g;

        ll h;
        while((h = gcd(m0, g)) != 1){
            m0 *= h;
            g /= h;
        }
        m1 *= g;
        a0 %= m0;
        a1 %= m1;
    }

    vector<long long> r = exgcd(m0, m1);
    ll p = r[0], q = r[1];
    g = r[2];

    ll m = m0 * m1;
    a0 %= m;
    p %= m;
    a1 %= m;
    q %= m;
    ll x = a0 * q * m1 + a1 * p * m0;
    
    x %= m;
    if(x < 0)x += m;

    return make_pair(x, m);
}

int main(){
    vi X(3), Y(3);
    ll x, y;
    rep(i, 3)cin >> X[i] >> Y[i];
    x = X[0], y = Y[0];
    FOR(i, 1, 3){
        tie(x, y) = crt(x, y, X[i], Y[i]);
        if(x == -1)break;
    }
    cout << x << endl;
}