#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <limits>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <functional>
#include <iomanip>

using namespace std;

#ifdef LOCAL
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
#define eprintf(...) 42
#endif
using ll = long long;
using vll = std::vector<ll>;
using vvll = std::vector<vll>;
using vvvll = std::vector<vvll>;
#define reps(i, S, E) for (ll i = (S); i <= (E); i++)
#define rep(i, N) reps(i, 0, N-1)
#define deps(i, E, S) for (ll i = (E); i >= (S); i--)
#define dep(i, N) deps(i, N-1, 0)
const ll INF = 1LL << 60;
const int INF_INT = 1 << 30;

template<class T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; }return false; }
template<class T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; }return false; }
struct mll {
	static ll MOD;
	ll val;
	mll(ll v = 0) : val(v % MOD) { if (val < 0) val += MOD; }
	mll operator - () const { return -val; }
	mll operator + (const mll &b) const { return val + b.val; }
	mll operator - (const mll &b) const { return val - b.val; }
	mll operator * (const mll &b) const { return val * b.val; }
	mll operator / (const mll &b) const { return mll(*this) /= b; }
	mll operator + (ll b) const { return *this + mll(b); }
	mll operator - (ll b) const { return *this - mll(b); }
	mll operator * (ll b) const { return *this * mll(b); }
	friend mll operator + (ll a, const mll &b) { return b + a; }
	friend mll operator - (ll a, const mll &b) { return -b + a; }
	friend mll operator * (ll a, const mll &b) { return b * a; }
	mll &operator += (const mll &b) { val = (val + b.val) % MOD; return *this; }
	mll &operator -= (const mll &b) { val = (val + MOD - b.val) % MOD; return *this; }
	mll &operator *= (const mll &b) { val = (val*b.val) % MOD; return *this; }
	mll &operator /= (const mll &b) {
		ll c = b.val, d = MOD, u = 1, v = 0;
		while (d) {
			ll t = c / d;
			c -= t * d; swap(c, d);
			u -= t * v; swap(u, v);
		}
		val = val * u % MOD;
		if (val < 0) val += MOD;
		return *this;
	}
	mll &operator += (ll b) { return *this += mll(b); }
	mll &operator -= (ll b) { return *this -= mll(b); }
	mll &operator *= (ll b) { return *this *= mll(b); }
	mll &operator /= (ll b) { return *this /= mll(b); }
	bool operator == (const mll &b) { return val == b.val; }
	bool operator != (const mll &b) { return val != b.val; }
	bool operator == (ll b) { return *this == mll(b); }
	bool operator != (ll b) { return *this != mll(b); }
	friend bool operator == (ll a, const mll &b) { return mll(a) == b.val; }
	friend bool operator != (ll a, const mll &b) { return mll(a) != b.val; }
	friend ostream &operator << (ostream &os, const mll &a) { return os << a.val; }
	friend istream &operator >> (istream &is, mll &a) { return is >> a.val; }
	static mll Combination(ll a, ll b) {
		chmin(b, a - b);
		if (b < 0) return mll(0);
		mll c = 1;
		rep(i, b) c *= a - i;
		rep(i, b) c /= i + 1;
		return c;
	}
};
using vmll = std::vector<mll>;
using vvmll = std::vector<vmll>;
using vvvmll = std::vector<vvmll>;
using vvvvmll = std::vector<vvvmll>;

struct Fast {
	Fast() {
		cin.tie(0);
		ios::sync_with_stdio(false);
		cout << fixed << setprecision(std::numeric_limits<double>::max_digits10);
	}
} fast; //cin,cout高速化のおまじない＋桁数指定

ll mll::MOD = (ll)(1e9 + 7);// 998244353ll;


int main() {
	ll T1;
	cin >> T1;
	ll T2;
	cin >> T2;
	ll A1;
	cin >> A1;
	ll A2;
	cin >> A2;
	ll B1;
	cin >> B1;
	ll B2;
	cin >> B2;

	//ll distOneFrecA = T1 * A1 + T2 * A2;
	//ll distOneFrecB = T1 * A2 + T2 * A2;

	//if (distOneFrecA == distOneFrecB) {
	//	cout << "infinity" << endl;
	//	return 0;
	//}

	ll subDistT1 = T1 * A1 - T1 * B1;
	ll subDistT2 = T2 * A2 - T2 * B2;

	if (subDistT1 + subDistT2 == 0) {
		cout << "infinity" << endl;
		return 0;
	}

	if (subDistT1 < 0 && subDistT1 + subDistT2 < 0) {
		cout << 0 << endl;
		return 0;
	}

	if (subDistT1 > 0 && subDistT1 + subDistT2 > 0) {
		cout << 0 << endl;
		return 0;
	}

	//1回以上

	//sub1+sub2>0となるようにしておく
	ll sub1 = subDistT1;
	ll sub2 = subDistT2;
	if (sub1 + sub2 < 0) {
		sub1 *= -1;
		sub2 *= -1;
	}

	//sub1→sub2のときに、必ず0を超える(ちょうどゼロならinf、ゼロ以下なら0)
	//sub1で下げたところを起点に考えると、sub1+2で上げたところでゼロを超え+1回、
	//sub1+2+1で下げたところでゼロを切って+1回 or タッチで+1回(これで終わり) or ゼロに触れずこれで終わり
	//sub1→sub1+2+1の差分でこの判定ができる

	ll bias = -sub1;
	ll upOneFrec = sub2 + sub1;
	ll result = 0;

	if (bias % upOneFrec == 0) {
		//↑↓のときにタッチして終了するパタン
		result = bias / upOneFrec * 2;
	}
	else {
		//↑↓のときにタッチせず終了するパタン
		result = (bias / upOneFrec) * 2 + 1;
	}

	cout << result << endl;

	return 0;
}


Measured memory_bytes: 256