diff --git a/others/test4.cpp b/others/test4.cpp
new file mode 100644
index 0000000..5e10680
--- /dev/null
+++ b/others/test4.cpp
@@ -0,0 +1,14 @@
+#include<bits/stdc++.h>
+using namespace std;
+#define int long long 
+const int N = 1e5+7;
+int dp[N];
+signed main(){
+    dp[1] = dp[2] = 1;
+    int n; cin >> n;
+    for(int i = 3; i <= n; i++){
+        dp[i] = dp[i-1] + dp[i-2];
+    }
+    cout << dp[n] << endl;
+    return 0;
+}
\ No newline at end of file