#include <stdio.h>

unsigned mcd(unsigned, unsigned);
unsigned suma_cien(unsigned);

int main() {

  unsigned a, b, c;

  printf("Introducir \"a\" y \"b\": ");
  scanf("%u %u", &a, &b);

  c = mcd(a, b);
  printf("Suma: %u.\n\n", suma_cien(c));

  system("pause");
  return 0;
}

unsigned mcd(unsigned x, unsigned y) {

  while (x != y)
        if (x > y)
           x -= y;
        else
           y -= x;

  return x;
}

unsigned suma_cien(unsigned x) {

  unsigned sum = 0, tope = x + 100;

  x++;            /* x = x + 1; */

  while (x <= tope) {
        sum += x; /* sum = sum + x; */
        x++;      /* x = x + 1; */
        }

  return sum;
}