diff --git a/homework3/Stack.cpp b/homework3/Stack.cpp
index 66c3450..b6766df 100644
--- a/homework3/Stack.cpp
+++ b/homework3/Stack.cpp
@@ -37,5 +37,6 @@ int pop(stack &s) {
         return NULL;
     }
     int e = s.data[s.top];
+    s.top--;
     return e;
 }
diff --git a/homework3/test1.cpp b/homework3/test1.cpp
index 7a19bbc..d6f5983 100644
--- a/homework3/test1.cpp
+++ b/homework3/test1.cpp
@@ -2,7 +2,23 @@
 #include<iostream>
 using namespace std;
 
-int main() {
+string getBinary(int i) {
+    stack s;
+    initStack(s);
+    while (i != 0) {
+        push(s, i % 2);
+        i /= 2;
+    }
+    string str = "";
+    while (!isEmpty(s)) {
+        str += pop(s) + '0';
+    }
+    return str;
+}
 
+int main() {
+    int decimal;
+    cin >> decimal;
+    cout << getBinary(decimal) << endl;;
     return 0;
 }