using system;
namespace ifelseifelse {
class program {
static void main ( string [] args){
int x =70 ;
if (x>=90) {
Console.WriteLine("A");}
else if (x>=80){
Console.WriteLine("B");}
else if (x>=70){
Console.WriteLine("C");}
else if (x>=60){
Console.WriteLine("D");}
else {
Console.WriteLine("E");}
Console.ReadLine;
}
}
}