diff --git a/Number of People Aware of a Secret.cpp b/Number of People Aware of a Secret.cpp
new file mode 100644
index 0000000..6c9a52d
--- /dev/null
+++ b/Number of People Aware of a Secret.cpp	
@@ -0,0 +1,19 @@
+class Solution {
+public:
+    int peopleAwareOfSecret(int n, int delay, int forget) {
+        vector<long long> dp(n + 1, 0);
+        dp[1] = 1;
+        long long share = 0, MOD = 1000000007;
+        for (int t = 2; t <= n; t++) {
+            if (t - delay > 0)
+                share = (share + dp[t - delay] + MOD) % MOD;
+            if (t - forget > 0)
+                share = (share - dp[t - forget] + MOD) % MOD;
+            dp[t] = share;
+        }
+        long long know = 0;
+        for (int i = n - forget + 1; i <= n; i++)
+            know = (know + dp[i]) % MOD;
+        return (int)know;
+    }
+};