4 files changed, 18 insertions, 0 deletions
diff --git a/cses/IntroductoryProblems/BitStrings/main b/cses/IntroductoryProblems/BitStrings/main
new file mode 100755
index 0000000..177fec4
--- /dev/null
+++ b/cses/IntroductoryProblems/BitStrings/main
diff --git a/cses/IntroductoryProblems/BitStrings/main.cpp b/cses/IntroductoryProblems/BitStrings/main.cpp
new file mode 100644
index 0000000..db812c5
--- /dev/null
+++ b/cses/IntroductoryProblems/BitStrings/main.cpp
@@ -0,0 +1,16 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+  int n;
+  int m = 1e9 + 7;
+  cin >> n;
+  long long ans = 0;
+  while(n--) {
+    ans += ((2 % m) * (2 % m)) % m;
+  }
+  cout << ans << '\n';
+}
diff --git a/cses/IntroductoryProblems/BitStrings/main_input0.txt b/cses/IntroductoryProblems/BitStrings/main_input0.txt
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ b/cses/IntroductoryProblems/BitStrings/main_input0.txt
@@ -0,0 +1 @@
+3
diff --git a/cses/IntroductoryProblems/BitStrings/main_output0.txt b/cses/IntroductoryProblems/BitStrings/main_output0.txt
new file mode 100644
index 0000000..45a4fb7
--- /dev/null
+++ b/cses/IntroductoryProblems/BitStrings/main_output0.txt
@@ -0,0 +1 @@
+8