#include <stdio.h>
int perfect_number(int n) {
int i, sum = 0;
for (i = 1; i < n; i++) {
if (n % i == 0)
sum += i;
}
if (n == sum)
return 1;
return 0;
}
int main() {
int i, sum=0;
for (i = 2; i <= 100; i++) {
if (perfect_number(i))
sum += i;
}
printf("%d", sum);
return 0;
}