First C which is broken

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#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    int d = 0;
    int e = 0;


    printf("Enter the 1st number ");
    scanf("%d /n", &a);

    printf("Enter the 2nd number ");
    scanf("%d /n", &b);

    printf("Enter the 3rd number ");
    scanf("%d /n", &c);

    printf("Enter the 4th number ");
    scanf("%d /n", &d);

    printf("Enter the 5th number ");
    scanf("%d /n", &e);

    int res = a + b + c + d + e;
    printf("The sum of all the numbers is %d", res);
    return 0;
}