diff --git a/.gitignore b/.gitignore
index c795b05..b7c1c7e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-build
\ No newline at end of file
+build
+.idea
\ No newline at end of file
diff --git a/src/bigint.cpp b/src/bigint.cpp
index 80aa0cd..db96741 100644
--- a/src/bigint.cpp
+++ b/src/bigint.cpp
@@ -13,7 +13,11 @@ Bigint::Bigint()
     base = 1000000000;
     skip = 0;
 }
-
+Bigint::Bigint(const Bigint &b)
+        : number(b.number),
+          positive(b.positive),
+          base(b.base),
+          skip(b.skip) { }
 Bigint::Bigint(long long value)
 {
     base = 1000000000;
diff --git a/src/bigint.h b/src/bigint.h
index d92be13..d090bcb 100644
--- a/src/bigint.h
+++ b/src/bigint.h
@@ -20,6 +20,7 @@ class Bigint
     Bigint();
     Bigint(long long);
     Bigint(std::string);
+    Bigint(const Bigint& b);
 
     //Adding
     Bigint operator+(Bigint const &) const;