Write a program to print
1 if the three positive integers $a$, $b$, and $c$ are valid lengths of a triangle; print
We can verify the condition by assuring that all $a$, $b$, and $c$ are positive, and the sum of any two of them is greater than the third.
給三個整數 $a,; b,; c$ 分別代表三角形的邊長。如果能拼成一個三角形，輸出
There are three lines in the input. The first line has the integer $a$, the second line has the integer $b$, and the third line has the integer $c$.
There is one line in the output.
The line has
1 if the lengths are valid,