k = int(input())
DL = [list(map(int,input().split())) for i in range(k)]
mod = 10**9+7

ans = 0

dp = [0]*7

for d,l in DL:

    p7 = pow(10,l,7)
    ndp = [0]*7

    ad = d*(p7-1)*4%7
    ans += ad
    ndp[ad] += 1
    for i in range(7):
        if dp[i]:
            nad = (i*p7+ad)%7
            ans += dp[i]*nad
            ndp[nad] += dp[i]
            ndp[nad] %= mod
            ndp[i] += dp[i]
            ndp[i] %= mod
    dp = ndp
print(ans)