#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <set>
#include <map>
#include <vector>
#include <string>

#include <cmath>
#include <queue>
#include <stack>

using namespace std;

#define LL long long

const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};

LL mod(LL x, LL md) {
	return ((x % md) + md) % md;
}

class Mint {
public:
	static LL md;
	LL x;
	Mint(LL _x = 0) {
		x = mod(_x, md);
	}
	Mint(const Mint &y) {
		x = mod(y.x, md);
	}
};

void MintMyExgcd(LL a, LL b, LL &x, LL &y) {
	// solve equation ax + by = 1 (mod m)
	LL md = Mint::md;
	if (b == 0) {
		y = 0;
		x = 1;
		return ;
	}
	MintMyExgcd(b, a % b, x, y);
	LL t = y;
	y = mod(x - (a / b) * y, md);
	x = t;
}

LL MintNY(LL x) {
	if (x == 0) {
		return 1;
	}
	LL md = Mint::md;
	LL a, b;
	MintMyExgcd(x, md, a, b);
	while (a < 0) {
		a += md;
	}
	return a;
}

/* LL gcd(LL a, LL b) {
	if (b == 0) {
		return a;
	}
	return gcd(b, a % b);
} */

Mint operator+(Mint a, Mint b) {
	return Mint(mod(a.x + b.x, Mint::md));
}
Mint operator-(Mint a, Mint b) {
	return Mint(mod(a.x - b.x, Mint::md));
}
Mint operator*(Mint a, Mint b) {
	return Mint(mod(a.x * b.x, Mint::md));
}
Mint operator/(Mint a, Mint b) {
	Mint c = Mint(MintNY(b.x));
	return Mint(mod(a.x * c.x, Mint::md));
}

Mint operator-(Mint a) {
	return Mint(-a.x);
}
bool operator==(Mint a, Mint b) {
	return a.x == b.x;
}
bool operator!=(Mint a, Mint b) {
	return a.x != b.x;
}
bool operator>(Mint a, Mint b) {
	return a.x > b.x;
}
bool operator<(Mint a, Mint b) {
	return a.x < b.x;
}
bool operator>=(Mint a, Mint b) {
	return a.x >= b.x;
}
bool operator<=(Mint a, Mint b) {
	return a.x <= b.x;
}

void operator+=(Mint &a, Mint b) {
	a = a + b;
}
void operator-=(Mint &a, Mint b) {
	a = a - b;
}
void operator*=(Mint &a, Mint b) {
	a = a * b;
}
void operator/=(Mint &a, Mint b) {
	a = a / b;
}

ostream& operator<<(ostream &out, Mint a) {
	out << a.x;
	return out;
}

istream& operator>>(istream &in, Mint &a) {
	in >> a.x;
	return in;
}

Mint factorial(LL n) {
	if (n == 0) {
		return Mint(1);
	}
	Mint res = 1;
	for (LL i = 1; i <= n; ++i) {
		res *= i;
	}
	return res;
}
Mint multiRange(LL s, LL t) {
	Mint res = 1;
	for (LL i = s; i <= t; ++i) {
		res *= i;
	}
	return res;
}

Mint getC(LL n, LL k) {
	if (n - k < k) {
		return getC(n, n - k);
	}
	return multiRange(n - k + 1, n) / factorial(k);
}

Mint getA(LL n, LL k) {
	return multiRange(n - k + 1, n);
}

Mint countNonNegativeDivision(LL n, LL k) {
	return getC(n + k - 1, k - 1);
}
Mint countPositiveDivision(LL n, LL k) {
	if (n < k) {
		return 0;
	}
	if (k <= 0) {
		return 0;
	}
	return getC(n - 1, k - 1);
}
Mint quickMod(Mint a, LL b) {
	Mint res = 1;
	while (b > 0) {
		if (b % 2) {
			res *= a;
		}
		a *= a;
		b /= 2;
	}
	return res;
}
template<class TypeName>
vector<TypeName> getVector1D(int n, TypeName val) {
    return vector<TypeName>(n, val);
}
template<class TypeName>
vector<vector<TypeName> > getVector2D(int n1, int n2, TypeName val) {
    vector<vector<TypeName> > res(n1);
    for (int i = 0; i < n1; ++i) {
        res[i] = vector<TypeName>(n2, val);
    }
    return res;
}
template<class TypeName>
vector<vector<vector<TypeName> > > getVector3D(int n1, int n2, int n3, TypeName val) {
    vector<vector<vector<TypeName> > > res(n1);
    for (int i = 0; i < n1; ++i) {
        res[i] = vector<vector<TypeName> >(n2);
        for (int j = 0; j < n2; ++j) {
            res[i][j] = vector<TypeName>(n3, val);
        }
    }
    return res;
}
template<class TypeName>
vector<vector<vector<vector<TypeName> > > > getVector4D(int n1, int n2, int n3, int n4, TypeName val) {
    vector<vector<vector<vector<TypeName> > > > res(n1);
    for (int i = 0; i < n1; ++i) {
        res[i] = vector<vector<vector<TypeName> > >(n2);
        for (int j = 0; j < n2; ++j) {
            res[i][j] = vector<vector<TypeName> >(n3);
            for (int k = 0; k < n3; ++k) {
                res[i][j][k] = vector<TypeName>(n4, val);
            }
        }
    }
    return res;
}

LL Mint::md = 1000000007;
LL gcd(LL a, LL b) {
	// cout << a << ' ' << b << endl;
	if (b == 0) {
		return a; 
	} else {
		return gcd(b, a % b);
	}
}
class FS {
public:
	LL a, b;
	LL n2, n5;
	FS(LL _a, LL _b): a(_a), b(_b) {
		yf();
		getN();
	}
	void yf() {
		LL gg = gcd(a, b);
		// cout << "gg = " << gg << endl;
		a /= gg; b /= gg;
	}
	void getN() {
		n2 = 0; n5 = 0;
		while (a % 2 == 0) {
			++n2; a /= 2;
		}
		while (a % 5 == 0) {
			++n5; a /= 5;
		}
		while (b % 2 == 0) {
			--n2; b /= 2;
		}
		while (b % 5 == 0) {
			--n5; b /= 5;
		}
	}
};

// LL getDigit() {
// 	char c = getchar();
// 	while (c < '0' || c > '9') {
// 		c = getchar();
// 	}
// 	return c - '0';
// }
FS readFS() {
	LL b = 1, a = 0;
	bool dec = false;
	string s;
	cin >> s;
	for (int i = 0; i < s.length(); ++i) {
		if (s[i] == '.') {
			dec = true;
		} else {
			LL v = s[i] - '0';
			a = a * 10 + v;
			if (dec) {
				b = b * 10;
			}
		}
	}
	// cout << a << ' ' << b << endl;
	return FS(a, b);
}
int n;
LL res = 0;
vector<FS> a;

vector<vector<LL> > aa, ct;

LL getAA(LL n2, LL n5) {
	return aa[n2 + 70][n5 + 50];
}
LL getCT(LL n2, LL n5) {
	// cout << "getCT(" << n2 << ", " << n5 << ") = " << ct[n2 + 70][n5 + 50] << endl;
	return ct[n2 + 70][n5 + 50];
}
void incAA(LL n2, LL n5) {
	aa[n2 + 70][n5 + 50] += 1;
}


int main() {
	std::ios::sync_with_stdio(false);
    std::cin.tie(0);

	cin >> n;
	// cout << n << endl;  
	a.clear();

	aa = getVector2D(141, 101, (LL)(0));

	for (int i = 0; i < n; ++i) {
		a.push_back(readFS());
		LL n2 = a.back().n2, n5 = a.back().n5;
		// cout << a.back().a << ' ' << a.back().b << endl;
		// cout << n2 << ' ' << n5 << endl;
		incAA(n2, n5);
	}
	ct = getVector2D(141, 101, (LL)(0));
	int h = 141, w = 101;
	for (int i = h - 1; i >= 0; --i) {
		for (int j = w - 1; j >= 0; --j) {
			if (i == h - 1 && j == w - 1) {
				ct[i][j] = aa[i][j];
			} else if (i == h - 1) {
				ct[i][j] = ct[i][j + 1] + aa[i][j];
			} else if (j == w - 1) {
				ct[i][j] = ct[i + 1][j] + aa[i][j];
			} else {
				ct[i][j] = ct[i + 1][j] + ct[i][j + 1] - ct[i + 1][j + 1] + aa[i][j];
			}
			if (ct[i][j]) {
				// cout << "ct[" << (i - 70) << "][" << (j - 50) << "] = " << ct[i][j] << endl;
			}
		}
	}
	for (int i = 0; i < n; ++i) {
		LL n2 = a[i].n2, n5 = a[i].n5;
		LL cc = getCT(-n2, -n5);
		if (n2 >= 0 && n5 >= 0) {
			cc -= 1;
		}
		// cout << cc << endl;
		res += cc;
	}
	cout << (res / 2) << endl;

	return 0;
}

Measured memory_bytes: 11736