The first line of the standard input contains three integers n, g, k (2<=n,g<=1000000, 1<=k<=10^9), separated by single spaces. These specify the number of chambers, the number of ant groups and the number of ants the anteater devours at once. The chambers are numbered from 1 to n.
The second line contains g integers m[1],m[2],...,m[g](1<=m[i]<=10^9), separated by single spaces, where m[i] gives the number of ants in the i-th group at every entrance to the ant hill. The n-1 lines that follow describe the corridors within the ant hill; the i-th such line contains two integers a[i],b[i] (1<=a[i],b[i]<=n), separated by a single space, that indicate that the chambers no.a[i] and b[i] are linked by a corridor. The anteater has dug into the corridor that appears first on input.
第一行包含三个整数n,g,k,表示点数、蚂蚁群数以及k。
第二行包含g个整数m[1],m[2],...,m[g]，表示每群蚂蚁中蚂蚁的数量。
接下来n-1行每行两个整数，表示一条边，食蚁兽埋伏在输入的第一条边上。