#include <stdio.h>
int main(void) {
int a,b,s;
a=1;
b=a%3;
s=0;
while(a<=100)
{switch(b)
{case 0:
s=s;
break;
case 1:
case 2:
if(a%10>=6)
s=s+a;
else
s=s;
break;
}
a=a+1;
b=a%3;
}
printf("1から100のうち,3の倍数でもなく, 5の倍数でもない数字の中で,1の位の数字が6以上のものの和は%dである。\n",s
); return 0;
}
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