#include <bits/stdc++.h>
using namespace std;

#define int long long
//typedef pair<int, int> P;
#define mod 1000000007
#define INF (1LL<<60)
 
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)
#define YES puts("YES")
#define Yes puts("Yes")
#define NO  puts("NO")
#define No  puts("No")
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
 
const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };
 
 
#if 1
//-------------
// DUMPマクロ
// https://www.creativ.xyz/dump-cpp-652/
 
// vector
template <typename T>
istream& operator>>(istream& is, vector<T>& vec) {
    for (T& x : vec) is >> x;
    return is;
}
// pair
template <typename T, typename U>
ostream& operator<<(ostream& os, pair<T, U>& pair_var) {
    os << "(" << pair_var.first << ", " << pair_var.second << ")";
    return os;
}
// vector
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& vec) {
    os << "{";
    for (int i = 0; i < vec.size(); i++) {
        os << vec[i] << (i + 1 == vec.size() ? "" : ", ");
    }
    os << "}";
    return os;
}
// map
template <typename T, typename U>
ostream& operator<<(ostream& os, map<T, U>& map_var) {
    os << "{";
    repi(itr, map_var) {
        os << *itr;
        itr++;
        if (itr != map_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}
// set
template <typename T>
ostream& operator<<(ostream& os, set<T>& set_var) {
    os << "{";
    repi(itr, set_var) {
        os << *itr;
        itr++;
        if (itr != set_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}
 
#define DUMPOUT cerr
 
void dump_func() {
    DUMPOUT << endl;
}
template <class Head, class... Tail>
void dump_func(Head&& head, Tail&& ... tail) {
    DUMPOUT << head;
    if (sizeof...(Tail) > 0) {
        DUMPOUT << ", ";
    }
    dump_func(std::move(tail)...);
}
#ifdef DEBUG
#define DEB
#define dump(...)                                                              \
    DUMPOUT << "  " << string(#__VA_ARGS__) << ": "                            \
            << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]"        \
            << endl                                                            \
            << "    ",                                                         \
        dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif
#endif


signed main() {

    int T[2], A[2], B[2];
    cin >> T[0] >> T[1];
    cin >> A[0] >> A[1];
    cin >> B[0] >> B[1];
    
    if(A[0]*T[0]+A[1]*T[1]==B[0]*T[0]+B[1]*T[1]){
        cout << "infinity" << endl;
        return 0;
    }
    
    int a=A[0] - B[0];
    int b=A[1] - B[1];
    
    int s = a*T[0];
    int t = b*T[1];
    
    if(s+t==0){
        cout << "infinity" << endl;
        return 0;
    }
    
    if(s>0 && (s+t)>0){ cout << 0 << endl; return 0;}
    if(s<0 && (s+t)<0){ cout << 0 << endl; return 0;}

    if(s>0){ s*=-1; t*=-1;}
    
    // s<0, t>0
    assert(s<0 && t>0);
    if(s+t<0){ cout << 0 << endl; return 0;}
    
    
    // s<0, t>0, s+t>0
    assert(s<0 && t>0 && s+t>0);
    int x = (-s+s+t-1)/(s+t);
    
    assert(x*(s+t)>0 && x*(s+t)-t<0 && x*(s+t)+s>=0);
    
    int add=0;
    if(x*(s+t)+s==0) add=1;

    dump(s,t, x, add);

    cout << 2*x-1 +add<< endl;
    
}



Measured memory_bytes: 256