#include <stdio.h>
int main(){
int a=1,n=0;
while(n<=1000){
n=a+n;
a=a+1;
}
printf("1〜%dを足した時初めて1000を超えます\n",a
-1); return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CmludCBtYWluKCl7CiAgICBpbnQgYT0xLG49MDsKICAgIHdoaWxlKG48PTEwMDApewogICAgICAgIG49YStuOwogICAgICAgIGE9YSsxOwogICAgfQogICAgcHJpbnRmKCIx44CcJWTjgpLotrPjgZfjgZ/mmYLliJ3jgoHjgaYxMDAw44KS6LaF44GI44G+44GZXG4iLGEtMSk7CiAgICByZXR1cm4gMDsKfQ==