#include <stdio.h>
int sum(int a,int b, int f);

int main()
{
 int a;
 int b;
 int result = 0;

 printf("Enter two integers: ");
 scanf("%d %d", &a,&b);

 if(a < b){
   result = sum(a, b, 1);
 } else if(a > b) {
   result = sum(a, b, -1);
 } else {
   result = a + b;
 }
 printf("Result: %d", result);
 return 0;
}

int sum(int a, int b, int f) {
    if(a == b) {
        return a;
    } else {
        return sum(a + (f * 1),b , f) + a;
    }
}