#include <iostream>

using namespace std;

int a,b;
int v[3000001], r1,r2,r3,n1,n2,n3,a1,a2,a3, j, elem;
bool Freq[52000000];



int main()
{



    cin >> a1 >> r1 >> n1;

    v[++j] = a1;

    for(int i = 2; i <= n1; i++)
        v[++j] = v[j - 1] + r1;

    cin >> a2 >> r2 >> n2;

    v[++j] = a2;

    for(int i = 2; i <= n2; i++)
        v[++j] = v[j - 1] + r2;

    cin >> a3 >> r3 >> n3;

    v[++j] = a3;

    for(int i = 2; i <= n3; i++)
        v[++j] = v[j - 1] + r3;

    for(int i = 1; i <= n1 + n2 + n3; i++)
    {
        if(Freq[v[i]] == 0)
            elem += 1;

        Freq[v[i]] = 1;
    }

    cout << elem;

    return 0;
}