#include <stdio.h>

int gcd(int a, int b)
{
    if (b == 0)
        return a;
    else
        return gcd(b, a % b);
}

int main()
{
    int a, b;

    printf("2つの整数を入力してください:");
    scanf("%d %d", &a, &b);

    printf("%dと%dの最大公約数は%dです。\n", a, b, gcd(a, b));

    return 0;
}

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