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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	  int a = 7;
	  int b = 2;
	  int c = 1; 
	  int d = 5;
	   System.out.writeln(Math.max(Math.max(Math.max(a,b),Math.max(c,d))));
	}
}

Main.java:16: error: no suitable method found for max(int)
	   System.out.writeln(Math.max(Math.max(Math.max(a,b),Math.max(c,d))));
	                          ^
    method Math.max(int,int) is not applicable
      (actual and formal argument lists differ in length)
    method Math.max(long,long) is not applicable
      (actual and formal argument lists differ in length)
    method Math.max(float,float) is not applicable
      (actual and formal argument lists differ in length)
    method Math.max(double,double) is not applicable
      (actual and formal argument lists differ in length)
1 error

Standard output is empty