diff --git a/coder07/ProjectEuler#1.java b/coder07/ProjectEuler#1.java
new file mode 100644
index 0000000..b6dc191
--- /dev/null
+++ b/coder07/ProjectEuler#1.java
@@ -0,0 +1,24 @@
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int t = in.nextInt();
+        for(int a0 = 0; a0 < t; a0++){
+            long N = in.nextInt();
+            long n=N-1;
+            long n3=n/3;
+            long s=n3*(3+(n3*3))/2;
+            long n5=n/5;
+            long s1=n5*(5+(n5*5))/2;
+            long n15=n/15;
+            long s2=n15*(15+(n15*15))/2;
+            System.out.println(s+s1-s2);
+        }
+    }
+}
diff --git a/coder07/ProjectEuler#2.java b/coder07/ProjectEuler#2.java
new file mode 100644
index 0000000..549b43c
--- /dev/null
+++ b/coder07/ProjectEuler#2.java
@@ -0,0 +1,29 @@
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int t = in.nextInt();
+        for(int a0 = 0; a0 < t; a0++){
+            long n = in.nextLong();
+            long a=1,b=2,c,sum=2;
+            while(true)
+            {
+                c=a+b;
+                a=b;
+                b=c;
+                if(c>=n)
+                    break;
+                if(c%2==0)
+                    sum+=c;
+            }
+            System.out.println(sum);
+            
+        }
+    }
+}
\ No newline at end of file
diff --git a/coder07/ProjectEuler#3.java b/coder07/ProjectEuler#3.java
new file mode 100644
index 0000000..385e1da
--- /dev/null
+++ b/coder07/ProjectEuler#3.java
@@ -0,0 +1,43 @@
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+public class Solution {
+    
+
+    public static void main(String[] args) {
+      
+        Scanner in = new Scanner(System.in);
+        int t = in.nextInt();
+        for(int a0 = 0; a0 < t; a0++)
+        {
+            long n = in.nextLong();
+            long pf=0,root,root2,loop,q,f;
+            root=(long)Math.sqrt(n);
+            for(long i=1;i<=n/2;i++)
+            {
+                f=0;
+                if(n%i==0)
+                {  
+                    q=n/i;
+                    root2 = (long)Math.sqrt(q);
+                    for(loop=2; loop<=root2;loop++)
+                    {
+                        if(q%loop==0)
+                            f=1;
+                    }
+                    if(f==0)
+                    {
+                        System.out.println(q);
+                        break;
+                    }
+                }
+                
+            }
+            
+              
+      }     
+  }
+}
\ No newline at end of file