#include

int determine_max(int a,int b);

int main() { int number; scanf("%d",&number); int max = number; //将第一个值赋值给结果max

while (number != -1) {
    scanf("%d",&number);//输入新值
    if (number == -1) break;
    max = determine_max(max,number);//迭代
}

printf("%d",number1);

}

int determine_max(int a, int b) { int max; max = (a>b)?a:b;

return max;

}