Find percentage of a student when marks is given throught the keyboard

#include<stdio.h>
#include<conio.h>
void main()

{

            int sub,s1,s2,s3,s4,s5;
            float per;
            clrscr ();

printf("enter 5 sub marks :\n"); 
scanf("%d %d %d %d %d",&s1,&s2,&s3,&s4,&s5 );

          sub=s1+s2+s3+s4+s5;
          per=sub/5;

printf("percent is :%f ",per);

getch ();

}

Output : 

enter 5 sub marks :
50
60
40
70
58

percent is : 55.000000