K = int(input())
D = [0]*K
L = [0]*K
for i in range(K):
    D[i],L[i] = map(int,input().split())
mod = int(1e9+7)
div = pow(9,5,7)
dp = [[[0]*7 for j in range(7)] for i in range(K+1)]
dp[K][0][1] = 1
for i in reversed(range(K)):
    mem = pow(10,L[i],7)
    for j in range(7):
        for k in range(7):
            dp[i][j][k] += dp[i+1][j][k]
            dp[i][j][k] %= mod
            S = (mem*k%7-k)*div%7*D[i]%7+j
            S %= 7
            if S < 0:
                S += 7
            T = mem*k%7
            dp[i][S][T] += dp[i+1][j][k]
            dp[i][S][T] %= mod
ans = 0
for i in range(7):
    for j in range(7):
        ans += dp[0][i][j]*i
        ans %= mod
print(ans)