diff --git a/a1/program.c b/a1/program.c
new file mode 100644
index 0000000..9ac68c5
--- /dev/null
+++ b/a1/program.c
@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <math.h>
+
+
+char* check_math_problem(const char* problem) {
+    char* result_str = (char*)malloc(10 * sizeof(char)); 
+    if (result_str == NULL) {
+        fprintf(stderr, "Error with memory\n");
+        exit(EXIT_FAILURE);
+    }
+
+    
+    //char* copy = strcmp(problem);
+    char* copy = (char*)malloc((strlen(problem) + 1) * sizeof(char));
+    strcpy(copy, problem);
+    if (copy == NULL) {
+        fprintf(stderr, "Error with memory\n");
+        exit(EXIT_FAILURE);
+    }
+
+
+    char* src = copy;
+    char* dst = copy;
+    while (*src != '\0') {
+        if (*src != ' ') {
+            *dst++ = *src;
+        }
+        src++;
+    }
+    *dst = '\0';
+
+    
+    if (strlen(copy) == 0) {
+        free(copy);
+        return "CHYBA";
+    }
+   
+    
+    double n1, n2, res;
+    char sing, equel;
+    
+    if(sscanf(copy, "%lf%c%lf%c%lf", &n1, &sing, &n2, &equel, &res) !=5)
+    {
+        free(copy);
+        return "CHYBA";
+    }
+   // printf("%lf%c%lf%c%lf", n1, sing, n2, equel, res);
+    //return "1234";
+    
+
+    
+    double result;
+    switch (sing) {
+        case '+':
+            result = n1 + n2;
+            break;
+        case '-':
+            result = n1 - n2;
+            break;
+        case '*':
+            result = n1 * n2;
+            break;
+        case '/':
+            if (fabs(n2) < 1e-9) { 
+                free(copy);
+                return "ZLE";
+            }
+            result = n1 / n2;
+            break;
+        default:
+            free(copy);
+            return "CHYBA";
+    }
+
+    
+    if (fabs(result - res) < 0.01) {
+        strcpy(result_str, "OK");
+    } else {
+        strcpy(result_str, "ZLE");
+    }
+
+    free(copy);
+    return result_str;
+}
+
+int main() {
+    char problem[100]; 
+
+    
+    while (true) {
+        fgets(problem, sizeof(problem), stdin);
+        if (strlen(problem) == 1) { 
+            break;
+        }
+        printf("%s\n", check_math_problem(problem));
+    }
+
+    return 0;
+}