02_04

#include <stdio.h>

int main (void)
{
int n,m,conv;
printf("Input n m：");
scanf("%d %d",&n,&m);

if(n>m)
{
conv = n;
n = m;
m = conv;
}

if(n%2==0)
{
n=n+1;
}

int i,ans=0;

for(i=0;i<m;i++)
{
ans = ans + n;
n = n+2;

if(n>m)
{
break;
}
}

printf("%d\n",ans);

return 0;
}