diff --git a/src/sheet02.cpp b/src/sheet02.cpp
index f05cb33..400d152 100644
--- a/src/sheet02.cpp
+++ b/src/sheet02.cpp
@@ -7,8 +7,9 @@ double euclidean_length(const std::vector<double> &v);
 double scalar_product(const std::vector<double> &v, const std::vector<double> &w);
 std::vector<double> normalize(const std::vector<double> &v);
 double euclidean_distance(const std::vector<double> &v, const std::vector<double> &w);
-
 void print_dvector(const std::vector<double> &v);
+unsigned fibonacci_rec(unsigned n);
+unsigned fibonacci_nonrec(unsigned n);
 
 
 int main()
@@ -19,6 +20,8 @@ int main()
     std::cout << "scalar product of 'a' and 'b': " << scalar_product(a, b) << '\n';
     print_dvector(normalize(a));
     std::cout << "distance between 'a' and 'b': " << euclidean_distance(a, b) << '\n';
+    std::cout << "Recursive Fibonacci of 25: " << fibonacci_rec(50) << '\n';
+    std::cout << "Fibonacci of 50: " << fibonacci_nonrec(50) << '\n';
 }
 
 void print_dvector(const std::vector<double> &v) {
@@ -30,10 +33,7 @@ void print_dvector(const std::vector<double> &v) {
 double euclidean_length(const std::vector<double> &v)
 {
     double sum = 0;
-    for(int i=0; i<v.size(); ++i)
-    {
-        sum += v[i]*v[i];
-    }
+
     return std::sqrt(sum);
 }
 
@@ -68,4 +68,32 @@ double euclidean_distance(const std::vector<double> &v, const std::vector<double
         distance += (v[i]-w[i])*(v[i]-w[i]);
     }
     return std::sqrt(distance);
+}
+
+unsigned fibonacci_rec(unsigned n)
+{
+    if(n<=2)
+    {
+        return 1l;
+    }
+    else
+    {
+        return fibonacci_rec(n-1)+fibonacci_rec(n-2);
+    }
+}
+
+unsigned fibonacci_nonrec(unsigned n)
+{
+    unsigned fibo = 0;
+    unsigned prev_fibo = 1;
+    unsigned prev_prev_fibo = 0;
+
+   for(int i=2; i<=n; ++i)
+    {
+        fibo = prev_fibo + prev_prev_fibo;
+        prev_prev_fibo = prev_fibo;
+        prev_fibo = fibo;
+    }
+
+    return fibo;
 }
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