C Programming to calculate total and % along with division

/*to calculate total and percentage along with division*/
#include<stdio.h>
#include<stdlib.h>
int main( )
{
    int s1,s2,s3,s4,s5,tot;
    float per;
    printf ("enter the marks of 5 subjects: ");
    scanf ("%d%d%d%d%d",&s1,&s2,&s3,&s4,&s5);
    tot=s1+s2+s3+s4+s5;
    per=tot/500.0*100;
    printf ("total=%d",tot);
    printf ("\npercentage=%f",per);
    if (s1>=40&&s2>=40&&s3>=40&&s4>=40&&s5>=40)
    {
        if (per>=80)
            printf ("\ndistinction");
        else if (per>=60)
            printf ("\nfirst division");
        else if (per>=45)
            printf ("\nsecond division");
        else
            printf ("\nthird division");
    }
    else
        printf ("\nfail");
    system ("pause");
    return 0;
}