stock format_word(count,form1[32],form2[32],form3[32]){
     if(count>=0)
         count = count % 100;
         else
         count = count*-1 % 100;
     new lcount = count % 10;
     if (count >= 11 && count <= 19) return(form3);
     if (lcount >= 2 && lcount <= 4) return(form2);
     if (lcount == 1) return(form1);
     return form3;
}

new string[64];
format(string,sizeof(string),"%s",format_word(12,"день","дня","дней"));
SendClientMessage(playerid,0xFFF00A,string);