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

#ifdef _RUTHEN
#include "debug.hpp"
#else
#define show(...) true
#endif

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

#include <atcoder/modint>
using mint = atcoder::modint1000000007;
using mint2 = atcoder::modint;
ostream &operator<<(ostream &os, const mint &p) { return os << p.val(); }

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    mint2::set_mod(7);
    int K;
    cin >> K;
    V<ll> D(K), L(K);
    rep(i, K) cin >> D[i] >> L[i];
    V<mint> dp(7, 0);
    dp[0] = 1;
    rep(i, K) {
        V<mint> np = dp;
        mint2 v = 10, p = 10;
        v = v.pow(L[i]);
        p = p.pow(L[i]);
        v--;
        v /= 9;
        v *= D[i];
        rep(j, 7) np[(j * p + v).val()] += dp[j];
        dp = np;
    }
    mint ans = 0;
    rep(j, 7) ans += dp[j] * j;
    cout << ans.val() << '\n';
    return 0;
}