Bit++
The classic programming language of Bitland is Bit++. This language is so peculiar and complicated.
The language is that peculiar as it has exactly one variable, called x. Also, there are two operations:
- Operation ++ increases the value of variable x by 1.
- Operation -- decreases the value of variable x by 1.
A statement in language Bit++ is a sequence, consisting of exactly one operation and one variable x. The statement is written without spaces, that is, it can only contain characters "+", "-", "X". Executing a statement means applying the operation it contains.
A programme in Bit++ is a sequence of statements, each of them needs to be executed. Executing a programme means executing all the statements it contains.
You're given a programme in language Bit++. The initial value of x is 0. Execute the programme and find its final value (the value of the variable when this programme is executed).
The first line contains a single integer n (1 ≤ n ≤ 150) — the number of statements in the programme.
Next n lines contain a statement each. Each statement contains exactly one operation (++ or --) and exactly one variable x (denoted as letter «X»). Thus, there are no empty statements. The operation and the variable can be written in any order.
Print a single integer — the final value of x.
1 ++X
1
2 X++ --X
0
by talk:如果是++就自加，--就自减，然后++情况有两种：X++与++X，那么我们只用判断a[0]与a[1]位置是否是+即可，--情况也是一样。