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# include <stdio.h>
int main (void)
{
printf ("%d\n", ({int n = 1, sum = 0;
for (; n <= 100;) sum += n ++;
sum;}));
}
# include <stdio.h>
int main (void)
{
printf (({int year; scanf ("%d", & year); year % 400 == 0 ? "yes.\n" : "no.\n";}));
}
# include <stdio.h>
int main (void)
{
int year;
printf (({scanf ("%d", & year); year % 400 == 0 ? "yes.\n" : "no.\n";}));
}