imran@pandora:~/Programming$ cat crap.c
#include <stdio.h>

int main(void)
{
        int a, b, c, sum;

        printf("Input three integers: ");
        scanf("%d %d %d",&a,&b,&c);
        sum = (((a + b + c) * 2) + 7);
        printf("Twice the sum of your integers plus 7 is %d\n",sum);
}
imran@pandora:~/Programming$ cc crap.c
imran@pandora:~/Programming$ ./a.out
Input three integers: 5
9
7
Twice the sum of your integers plus 7 is 49