#includevoid main() { int i,b,y; scanf("%d",&y); b=0; if ( y%4==0 ) { if ( y%100==0 ) { if ( y%400==0 ) b=1; } else b=1; } //printf("%d",y); if ( b==0 ) printf("不"); printf("是闰年\n"); if ( b ) printf("闰年\n");}