diff --git a/finite_function.hpp b/finite_function.hpp
index 1a76d9b..d78d1c0 100644
--- a/finite_function.hpp
+++ b/finite_function.hpp
@@ -1,7 +1,7 @@
 #include <array>
 #include <string>
 #include <utility>
-
+#include <iostream>
 typedef uint8_t CellType;
 
 // Пока положим, что только два аргумента, чтобы упростить реализацию
@@ -27,7 +27,11 @@ class FiniteFunction {
             for (auto ch: text_repr) {
                 if ( !isdigit(ch) )
                     continue;
-                _results.at(cur_ind) = std::stoi(std::string(1, ch));
+                set_result(
+                    cur_ind / BASE,
+                    cur_ind % BASE,
+                    std::stoi(std::string(1, ch))
+                );
                 ++cur_ind;
             }
             update_num();
@@ -36,11 +40,21 @@ class FiniteFunction {
 
         //  Устанавливает результат функции по двум аргументам
         void set_result(CellType first, CellType second, CellType result) {
-            _results[get_index(first, second)] = result;
+            //std::cout << "setting " << (int)first << "," << (int)second << " to " << (int)result << std::endl;
+            
+            uint8_t byte_num = get_index(first, second) / 4;
+            uint8_t shift = 2*(get_index(first, second) % 4);
+            //std::cout << "before: " << (int)_results[byte_num];
+            _results[byte_num] = (_results[byte_num] ^ (((_results[byte_num] >> shift)
+             & 0x03) << shift)) | (result <<shift);
+             //std::cout << " -> " << (int)_results[byte_num] << std::endl;
         }
 
         int operator() (CellType first, CellType second) const {
-            return _results[get_index(first, second)];
+            uint8_t byte_num = get_index(first, second) / 4;
+            uint8_t shift = 2*(get_index(first, second) % 4);
+            // возьмём последние два бита
+            return (_results[byte_num] >> shift) & 0x03;
         }
 
         bool operator < (const FiniteFunction &f) const {
@@ -142,12 +156,12 @@ class FiniteFunction {
         void update_num() {
             _num = 0;
             for (auto&& val: _results) {
-                _num *= BASE;
+                _num *= 256;
                 _num += val;
             }
         }
         uint32_t _num;
-        std::array<CellType, BASE*BASE> _results;
+        std::array<CellType, (BASE*BASE + 3) / 4> _results;
 };