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21 lines
363 B
C++

#include <cstdio>
int save,cur,touse;
int main()
{
for(int i=1; i<=12; i++)
{
cur+=300;
scanf("%d",&touse);
if(touse>cur)
{
printf("-%d",i);
return 0;
}
cur-=touse;
save+=cur/100*100;
cur%=100;
}
printf("%d",cur+save*6/5);
return 0;
}