diff --git a/OpenMP2/src/main.cpp b/OpenMP2/src/main.cpp
index 8dab215..8ae23eb 100644
--- a/OpenMP2/src/main.cpp
+++ b/OpenMP2/src/main.cpp
@@ -5,7 +5,11 @@
 
 double calc(uint32_t x_last, uint32_t num_threads)
 {
-  return 0;
+  double res = 0.0;
+  for (int i = x_last; i > 0; i--) {
+    res += 1.0/i;
+  }
+  return res;
 }
 
 int main(int argc, char** argv)