PROGRAMMING:Solve equation 1
Shao's mathematics is very poor, because his mathematics is taught by the physical education teacher. Now the physical education teacher has arranged many problems to solve the quadratic equation of one variable (AX ^ 2 + BX + C), just to judge whether there is a real root. He learned through a certain channel that programming can quickly solve these boring problems. Let's help him.
###Input format:
The values of a, B and C are all in the range of int.
###Output format:
If there is a real root, output "yes", otherwise output "no".
###Input example:
Here is a set of inputs. For example:
```in
1 2 1
```
###Output example:
The corresponding output is given here. For example:
```out
Yes
```
answer：If there is no answer, please comment
###Input format:
The values of a, B and C are all in the range of int.
###Output format:
If there is a real root, output "yes", otherwise output "no".
###Input example:
Here is a set of inputs. For example:
```in
1 2 1
```
###Output example:
The corresponding output is given here. For example:
```out
Yes
```
answer：If there is no answer, please comment