/* 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
{
{
int a=55;
int b=14;
int c=990;
System.
out.
println(calculate
(a,b,c
)); }
public static int calculate(int a,int b,int c){
if(b>=a || c< b){
return -1;
}
if(c%a==b){
return c;
}
else{
int r = (c-b)%a;
return c-r;
}
}
}
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