#include <stdio.h>
 
int main() {
    int day = 1;
    int saving = 1;         // 当日貯金する額（1円から始まって毎日2倍）
    int total = 1;          // 貯金の合計（初日は1円）
 
    printf("%d日目までの合計金額\t%d円\n", day, total);
 
    while (total <= 10000) {
        saving *= 2;        // 翌日の貯金額（2倍）
        day++;
        total += saving;    // 合計額を更新
 
        printf("%d日目までの合計金額\t%d円\n", day, total);
    }
 
    printf("\n1万円を超えたのは%d日目、合計金額は%d円でした。\n", day, total);
 
    return 0;
}
 
 

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