#include<cstdio>
int main(){
int m,n;
double min[100];
double temp;
double result;
scanf("%d %d",&m,&n);
for(int j=0;j<m;j++){
scanf("%lf",&temp);
min[j]=temp;
}
for(int i=1;i<n;i++){
for(int j=0;j<m;j++){
scanf("%lf",&temp);
if(temp<min[j]) min[j]=temp;
}
}
for(int i=0;i<m;i++){
result+=min[i];
}
printf("%.2lf",result);
return 0;
}
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