K = int(input())
dp = [[0 for _ in range(7)] for _ in range(6)]
dp[0][0] = 1
mod = 10 ** 9 + 7
mod7 = [1,3,2,6,4,5]
DL = [list(map(int, input().split())) for _ in range(K)]
for i in range(K):
    D, L = DL[-1 - i]
    newdp = [[0 for _ in range(7)] for _ in range(6)]
    for j in range(6):
        for k in range(7):
            newdp[j][k] += dp[j][k]
    for j in range(6):
        add = 0
        for k in range(L % 6):
            add = (add + mod7[(j + k) % 6] * D) % 7
        for k in range(7):
            newdp[(j + L) % 6][(k + add) % 7] += dp[j][k]
            newdp[(j + L) % 6][(k + add) % 7] %= mod
    dp = newdp

ans = 0
for i in range(6):
    for j in range(7):
        ans += dp[i][j] * j
        ans %= mod

print(ans)
exit()