diff --git a/a1/program.c b/a1/program.c
index e59b2d7..38ea520 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -76,7 +76,7 @@ int analizing_string(char* pointer){
     int i = 0;
     int counter=0;
     while(pointer[i]!='\0'){
-        if(pointer[i]=='+'||pointer[i]=='/'||pointer[i]=='*'||pointer[i]=='-'){
+        if(pointer[i]=='+'||pointer[i]=='/'||pointer[i]=='*'){
             operant=pointer[i];
             counter++;
             if(counter>1){
@@ -158,14 +158,16 @@ int skip_spaces(int i, char *pointer) {
 int copy_number(char number[], char *pointer, int i) {
     int destination_i = 0;
     while(pointer[i]!='\0'){
-        if (!isdigit(pointer[i])&&pointer[i]!='.'&&pointer[i]!=',') {
+        if (!isdigit(pointer[i])&&pointer[i]!='.'&&pointer[i]!=','&&pointer[i]!='-') {
+            break;
+        }
+        if (pointer[i] == '-' && destination_i > 0) {
             break;
         }
         number[destination_i] = pointer[i];
         destination_i++;
         i++;
     }
-
     return i;
 }