Impossible ! (H.E.L.P)

im trying to make this..

Code:

#include<stdio.h>
int main()
{
    int Year;
    int FirstDay;
    int Month;
    int Leap_Year;
    int Normal_Year;
    int weekday;
    int startday;
    int daycount;
    int days;
    
    
    printf("Input Year:");
    scanf("%d", &Year);
    printf("Input first day of the year as a number:");
    scanf("%d", &FirstDay);
    printf("Input Month to Display:");
    scanf("%d", &Month);
    
    Normal_Year = (((Year-1)*365) + (Year-1/4) - (Year-1/100) + (Year-1/400) + 1)%7;
    Leap_Year = ((Year-1)*365 + (Year-1/4) - (Year-1/100) + (Year-1/400))%7;
    
    if (Month=1)
        printf("January %d", Year);
    else if (Month=2)
        printf("February %d", Year);
    else if (Month=3)
        printf("March %d", Year);
    else if (Month=4)
        printf("April %d", Year);
    else if (Month=5) 
        printf("May %d", Year);
    else if (Month=6)
        printf("June %d",Year);
    else if (Month=7)
        printf("July %d", Year);
    else if (Month=8)
        printf("August %d", Year);
    else if (Month=9)
        printf("September %d", Year);
    else if (Month=10)
        printf("October %d", Year);
    else if (Month=11) 
        printf("November %d", Year);
    else if (Month=12)
        printf("December %d", Year);
    else 
        printf("PAmay may!");
    
    printf("\nResults:\n");    
    printf("\nSun\tMon\tTue\tWed\tThu\tFri\tSat\n");
    printf("\n---\t---\t---\t---\t---\t---\t---\n");
    
    for (weekday = 0; weekday <= startday; weekday++)
        printf(" ");
    if(Month==1 || Month==3 || Month==5 || Month==7 || Month==8 || Month==10 || Month==12)
         days=31;
    else if(Month==4 || Month==6 || Month==9 || Month==11)
         days=30;
    else if((Year%100!=0 && Year%4==0) || Year%400==0)
         days=29;
    else
         days=28;
        
    for    (daycount = 1; daycount <= days; daycount++)
        {
            if(weekday > 6)
            {
                printf("\n");
                weekday = 1;
            }
            
            else 
                weekday++;
                printf("%3d", daycount);
    return 0;
}
}

tell me what is wrong O_O

Well for one thing check your if else statements.... You need to use == NOT =

Please work it the other way around - you tell US what's wrong with the program, and we'll try to help you fix it. You obviously KNOW what's wrong, because you had to test it out.

So share - it really helps quickly focus everyone, on the same problem.