add codeforces solutions folder

codeforces/231A.cpp

@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    int n;
+    cin >> n;
+
+    int count = 0;
+
+    for(int i = 0; i < n; i++) {
+        int a, b, c;
+        cin >> a >> b >> c;
+
+        if(a + b + c >= 2) {
+            count++;
+        }
+    }
+
+    cout << count << endl;
+
+    return 0;
+}